DOCSLIB.ORG

The Grystal Structure of Rosetite

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Grystal Structure of Rosetite Canadian Mineralogist Vol. 15, pp. 3642 (1977) THE GRYSTALSTRUCTURE OF ROSETITE F. C. HAWTHORNE eNo R. B. FBRGUSON Dept, of Earth Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2 ABSTRACT 12.968(4),c 5.684(1)4, p 108.05(2).,er les dia- grarnmesde pr6cessionconfirmeut le groupnP21/c. The crystal strugtureof roselite, Cag(Mgb.assCoo$6) (AsO)r.29r9, La ros6lite est isoty?e de la kriihnkite, NazCu- has been refined in the spacegroup (SOr,.2HrO (Ilawthorne & Ferguson P2r/ c (a p L975b). l-z 5.801(1),D 12.898(3),c 5.617(DI"" structure est caract6risdepar des octa0dres isolds 107.42(2)' Z-2), ; lsitg, tlree-dimensionalcounter- Mg/Co, li& par les sommets aux t6traBdres As collected $ngle-crystal X-tay data; the final R index pour former paralldles for des chalnes i l'axe c. Ces 1194 observedreflegtions is 5.8Vo.Comparison chaines sont reli6es par gros of les cations Ca et des the cell dimensionsobtained in this studv with ponts hydrogdne. On trouve types structuraux the 2 axial ratios obtained from morphological stu- parmi les min6raux du groupe dies Culut+(X+O)z @eacock 1936) shows that the morphological .H:O, celui de la ros6lite, monoclinique, celui ceU was B-centred. et Conversely, tle cell derived in do la collinsite, CazMg(Poa)2.2H2O,triclinique. Les earlier X-ray (Wolfe studies 1940) is a haff-ce[ itr deux type,spossddent des chalnes identiques, tho E-centred setting. gs.eaamination mais of the iso- l'orientation relative des chalnes voisines diff0re structural miueral brandtite, CarMn(AsO)r.2HzO, quelque peu, ce qui entralne des changementsdans showedtlat tle cell derived in previous studieswas hatf Ia coordination du Ca et danslagencement des ponts also a cell; least-squaresrefinement of tle hydrogdne. powder diffraction gave patiern a 5.899(2), b (Iraduit par la R6daction) 12.968(4),c 5.684(1)A, p 108.05(2)., and sinele- cryotal precessionphotographs confirmed the space grcurt P2Jc. fNrnopuctroN Roselite is isostructural with tritbnkitc, NazCu Roselite is a pink hydrated arsenate,Caz(Co, (SOJ".2HrO (Ilawthorne & Ferguson 1975b). The Mg) (AsOa):'2Hfi, structure is characterizedby isolated Mg,/Co octa- that occurs with chalcedony hedra that are linked by corner sharing with As te- and drusy quartz in cavities in metalliferout trahedra to form chains parallel to the c axis. These quartzose veins. There has been a considerable chains are linked together by tle large Ca cations amount of work on the crystallography of rose- and hydrogen bonding. Two structure Epes exist in lite and its isomorph, brand ite (Ca,Mn(AsOa),. the minerals of tle group Ca24W+(X'+O)2.2IJ2O, 2HzO), and each new study has come to a dif- the monoclinic rosette structure and tle triclinic ferent conclusion; the present study is no excep- collinsite, CaaMg@O)r.2IIO, structure. Identical tion. Roselite was initially classed as ofihorhom- chai4s exist in both etructuresbut tle attitude of ad- bic (Levy 1824) until Schrauf (1873) concluded jacent chains is slightly different, leading to changes that it was triclinic, pseudo-orthorhombic. Sub- in the Ca coordination and hydrogen bonding ar- rangem€nts. sequently, Lindstrom (1918) proposed that brandtite was triclinic and isomorphic with rose- lite. Aminoff (1919) later proposed that brand- Sopnuernn tite was monoclinic holohedral with the axial ratios given in Table 1. An extremely detailed La structure cristalline de la ros6lite, Ca2(Mgo.a*- (1936) Coo.rrr) (AsOolr.2grq a &€ affilrfp dans p2t/c (a study by Peacock showed roselite to be 5.801(1),D 12.898(3),c 5.6r7G)Iu F rot.ize)b; monoclinic holohedral with axial ratios similar Z-Z) a faide des donn6es tridimensionnelles des to those earlier established for brandtite (Iable rayous X, obtenues sur diffractom&tre i compteur 1). Single-crystal X:ray photogaphs (Wolfe avec cristal unique. Le r&idu final pour les 1194 1940) confirmed the monoclinic symmetry of r6flexions st R=5.8Vo. En comparant le.s dimen- both speciesbut indicated that the morphological sions de la maille ci-dessw aux rapports d,axesmor- studies had resulted in a double cell. These re- phologiques@eacock 1936), on remarque que la sults were apparently confirmed for brandtite by maille morphologique 6tait i face B centr6e. Par Dahlman (1951), who solved the structures of contre, la premibre maille obtenue aux rayons X brandtite and krohnkite CNarCu(SO)r,2HrO)i (Wolfe 1940) n'6tait qu'une demi-maille !. Et la the cell dimensions obtained by Wolfe (1940) brandtite, Carl\r!(Asotr,2f|.zA, isotfpe de la ros6- given lite, avait, elle aussi, 6t€ rapportde i une demi- and Dahlman (1951) are in Table 1. As maille; faftinement du diagramme de poudre par part of a study on the stereochemistry of the moindres car6s donne la maille: a 5.899(2), b (Ass+Oo)s group (Ilawthorne 1976a,b), we de- 36 CRYSTAL STRUCTURB OF ROSELITB 37 cided to refine tle sftucture of roselite; how- Ercrx,nvreNrer, ever, in view of the results obtained, the study was also extended to include brandtite. The crystals used in this investigation are from Schneeberg Germany. A partial chemical anal- ysis was performed and the results are given in 1ABIJ 1. axrAl nATlos Ar{DcqLL Drmsrons 1t1 ror nosrrrm, nratr IITE ANDKIOE!{KIIf, Table 2; unit-cell contents were oalculated as- suming the formula CarMg,Co),(AsOn)".2HaO qbcB;::$Rere,ence with the MgCo ratio derived from the chemical analysis. RoeeL:Lte Single-crystal X-ray precession photographs 0.8780 1.0 0.4398 100.9. Monoc. Pacock (1936) confirmed the monoclinic stmmsfry established s.ooi rz.so! 5.60 100.8" p2lla wolfe (1940) by earlier studies. Ilowever, the unit cell ap- 5.616(2) 12.893(4)11.277(3) 1O1.OL(3)o 821la This srudyl peared to be twice the volume assigned by Wolfe (1940), ,agreement s.799 12.893 5.616 L01,37" P2rla ThLe erudy2 with axial ratios in with the morphological work of Peacock (1936). The s.80r(1) 12.898(3) 5.6L7(D 707.42(2). rhls study3 "2rlo following systematic extinctions were observed: Brandt!te hkl, h+l = 2n*I; hoo, h=2n*l; ok0, k= 0.4720 1.0 0.4475 99.5" Moooc. lotnoff (1919) 2n*I;001, I=2n*l; this is compatiblewith the 5.65 12.80 5.65 99.5. p2rla Dahl@ (1951) space groups BL/a ar;ld.BLlc, As indicated by s.6a4 12.968 11,399 roo.24o E2tla rhlo atudy4 the B-centring, an alternative primitive cell of have been chosen; how- 5.899<2) L2.968(4) 5.684(1) ).O8.0512)" p2rla Thte etudy3 half the volume could ever, the B-centred cell was retained becauseof Kaohoklte tho probable relationship between the structures 0.4586 1,0 pslache 0.4357 108.5' Uodoc. (1936) of roselite and brandtite @ahlman 1951). Unit- 5.eO7O) 12,656(2) 5.517(1) 1A8.32(L)o P2./a n&bode - & cell parameters were determined from least- Fe!8aon (1975b) squares refinement of fifteen intense reflections _Shg1e-crystaLI zttdsfomed dlf f racrreter results; fM B-c@treal aligned automatically on a four-circle diffracto- -froo the results given in Table 1. As a !o ptbLtlge cell; least-sq@les lefl!(@t ol pdde, pettem; meter; are Alroefosd check on these values, the powder pattern of f,!@ prleltlve cell ro A-ceotreil cell, roselite was recorded using a Phillips powder diffractometer operating at Veo2|/rnrn and using = TABLE 2. MISCEI.I,ANEOOS INFORMAIION FOR ROSELITE C\rKa radiation (l 1.5418A); least-squaresre- finement subsequently confirmed the single- crystal diffractometer values. - PaltiaL Analyslsz V€O 4.42, CoO - 8.71 vt.Z The crystal used in the collection of the in- Unlt fo@ula - C"2 (MBo. (As04)2. 2I{20 4g5CoO.515) tensity data was an irregular equidimensional fragment -O.15mm in diameter. A total of 1521. A2Lla p2L/c intensities was collected over one asymmetric a 5.616(2)R sJsge)8, unit out to 2|(MoKa) 65o according to the ex- b 12.893(4) 12.893(4) perimental procedure of Hawthorne & Ferguson c 77.277(3) 5.616(2) (1975u). One standard reflection was examined p ror.or(:)o rol.:z(:)o every 50 reflections to check for constancy of Space cloup R2Lla P2Llc crystal alignment; no significant change was v 8oo.g8' aoo.sR' noted during the data collection. The data were conected for absorption, Lorentz, polarization and background effects and converted to struc- lo. or I52I lr"o,l ture factors. A reflection was considered as ob- D"u1. 3.617 No. of 41 1194 lroU"l) served if its magnitude exceeded that of four Cryetal Slze 0,15@ Flnal R (obBeryed) 5.82 standard deviations based on counting statistics; 0.84 Flnal R (a11 d,ata) 6.12 1.R application of this criterion resulted n ll94 Radnlon t4o/C Flnal R!(observed) 6.72 observedreflections. Flml Rs(all- data) 7 .32 * -f,rlr.o"l- 1'".r"1y'f, p.o,; Srnucnrnr SolurloN eNp RenNnMeNr 2,\ R'V'A' - (I-w( lr . | - lr 1,2/P--- wL--' curves atoms caIQ) )' Analytic scattering for neutral l-obel l fLvro6" (1968) rgg --l were taken from Cromer & Mann with Tsp. factor foft used: nrn: "* /r: anomalous dispersion coefficients fiom Cromer l- _L h I & Liberman (1970). Crystal-structure refine- ment was carried out using the least-squares 38 TTIE CANADIAN MINERALOGIST TABLE 3. AlO!fiC POSITIONS AND EQUIVALENI ISOTROPIC TTMPETATURE TABI.E 5. SELECTED INTERATO!,flC DISTANCES AND A{GI,ES FOR ROSELITE 1 TACIORS IN ROSELITE tu-o(L)a r.aeo(e)t A€-0(2) r..696(6) ca-o(1)d 2.35s(6)8 B cR2r &-0(3) 1.703(6) ca-0(2) 2.419(6) Ag-0 (4) 1.689(6) ca-0(2)e 2.502(6) ce-0(3)d 2.421(6) (e-o) 1.68e Ca-0(4)d 2.481(6) 0 o ca-0(4)f 2.42L(6) r{e/co o.ze(:) !18,/co-0(2)b 2.197<6) z2 3 0 Ca-0(v) 2.399(6) Mc/co-o(3)c 2.056(6) a2 ltg/ceo(r) 2.060(6) (ca-o) 2.440 0.9498(2) 0.
Load more

Recommended publications
  • Cobalt Mineral Ecology
    American Mineralogist, Volume 102, pages 108–116, 2017 Cobalt mineral ecology ROBERT M. HAZEN1,*, GRETHE HYSTAD2, JOSHUA J. GOLDEN3, DANIEL R. HUMMER1, CHAO LIU1, ROBERT T. DOWNS3, SHAUNNA M. MORRISON3, JOLYON RALPH4, AND EDWARD S. GREW5 1Geophysical Laboratory, Carnegie Institution, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A. 2Department of Mathematics, Computer Science, and Statistics, Purdue University Northwest, Hammond, Indiana 46323, U.S.A. 3Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, Arizona 85721-0077, U.S.A. 4Mindat.org, 128 Mullards Close, Mitcham, Surrey CR4 4FD, U.K. 5School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, U.S.A. ABSTRACT Minerals containing cobalt as an essential element display systematic trends in their diversity and distribution. We employ data for 66 approved Co mineral species (as tabulated by the official mineral list of the International Mineralogical Association, http://rruff.info/ima, as of 1 March 2016), represent- ing 3554 mineral species-locality pairs (www.mindat.org and other sources, as of 1 March 2016). We find that cobalt-containing mineral species, for which 20% are known at only one locality and more than half are known from five or fewer localities, conform to a Large Number of Rare Events (LNRE) distribution. Our model predicts that at least 81 Co minerals exist in Earth’s crust today, indicating that at least 15 species have yet to be discovered—a minimum estimate because it assumes that new minerals will be found only using the same methods as in the past. Numerous additional cobalt miner- als likely await discovery using micro-analytical methods.
    [Show full text]
  • Mineralogy and Crystal Structure of Bouazzerite from Bou Azzer, Anti-Atlas, Morocco: Bi-As-Fe Nanoclusters Containing Fe3+ in Trigonal Prismatic Coordination
    American Mineralogist, Volume 92, pages 1630–1639, 2007 Mineralogy and crystal structure of bouazzerite from Bou Azzer, Anti-Atlas, Morocco: Bi-As-Fe nanoclusters containing Fe3+ in trigonal prismatic coordination JOËL BRUGGER,1,* NICOLAS MEISSER,2 SERGEY KRIVOVICHEV,3 THOMAS ARMBRUSTER,4 AND GEORGES FAVREAU5 1Department of Geology and Geophysics, Adelaide University, North Terrace, SA-5001 Adelaide, Australia and South Australian Museum, North Terrace, SA-5000 Adelaide, Australia 2Musée Géologique Cantonal and Laboratoire des Rayons-X, Institut de Minéralogie et Géochimie, UNIL-Anthropole, CH-1015 Lausanne- Dorigny, Switzerland 3Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia 4Laboratorium für chemische und mineralogische Kristallographie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland 5421 Avenue Jean Monnet, 13090 Aix-en-Provence, France ABSTRACT Bouazzerite, Bi6(Mg,Co)11Fe14[AsO4]18O12(OH)4(H2O)86, is a new mineral occurring in “Filon 7” at the Bou Azzer mine, Anti-Atlas, Morocco. Bouazzerite is associated with quartz, chalcopyrite, native gold, erythrite, talmessite/roselite-beta, Cr-bearing yukonite, alumopharmacosiderite, powellite, and a blue-green earthy copper arsenate related to geminite. The mineral results from the weathering of a Va- riscan hydrothermal As-Co-Ni-Ag-Au vein. The Bou Azzer mine and the similarly named district have produced many outstanding mineral specimens, including the world’s best erythrite and roselite. Bouazzerite forms monoclinic prismatic {021} crystals up to 0.5 mm in length. It has a pale 3 apple green color, a colorless streak, and is translucent with adamantine luster. dcalc is 2.81(2) g/cm (from X-ray structure refi nement).
    [Show full text]
  • The Origins of Color in Minerals Four Distinct Physical Theories
    American Mineralogist, Volume 63. pages 219-229, 1978 The origins of color in minerals KURT NASSAU Bell Laboratories Murray Hill, New Jersey 07974 Abstract Four formalisms are outlined. Crystal field theory explains the color as well as the fluores- cence in transition-metal-containing minerals such as azurite and ruby. The trap concept, as part of crystal field theory, explains the varying stability of electron and hole color centers with respect to light or heat bleaching, as well as phenomena such as thermoluminescence. The molecular orbital formalism explains the color of charge transfer minerals such as blue sapphire and crocoite involving metals, as well as the nonmetal-involving colors in lazurite, graphite and organically colored minerals. Band theory explains the colors of metallic minerals; the color range black-red-orange- yellow-colorless in minerals such as galena, proustite, greenockite, diamond, as well as the impurity-caused yellow and blue colors in diamond. Lastly, there are the well-known pseudo- chromatic colors explained by physical optics involving dispersion, scattering, interference, and diffraction. Introduction The approach here used is tutorial in nature and references are given for further reading or, in some Four distinct physical theories (formalisms) are instances, for specific examples. Color illustrations of required for complete coverage in the processes by some of the principles involved have been published which intrinsic constituents, impurities, defects, and in an earlier less technical version (Nassau, 1975a). specific structures produce the visual effects we desig- Specific examples are given where the cause of the nate as color. All four are necessary in that each color is reasonably well established, although reinter- provides insights which the others do not when ap- pretations continue to appear even in materials, such plied to specific situations.
    [Show full text]
  • ON ROSELITE and the RULE of HIGHEST PSEUDO-SYMMETRY M. A. Pbecock, Haraard Uniaers.I.Ty, Cambrid.Ge, Mass. Suuueny
    ON ROSELITE AND THE RULE OF HIGHEST PSEUDO-SYMMETRY M. A. PBecocK,Haraard Uniaers.i.ty,Cambrid.ge, Mass. Suuueny Revision of the geometrical and optical crystallography of roserite-(ca, co, Mg)' As2o3'2H2o from Schneeberg, saxony, Ieads to results that difier in many important respects from the classical data of Schrauf (1s74). Roselite proves to be monoclinic, pris- matic; a:b:c:0.8780:1:0.4398,9:100"53,; forms: c{001}, b{010}, o[100], jll}Ol. fr I350 l, l,l230l, mllljl, nl2t\l , ol0r2l, p{tl':Il, qlTrrl, rl238l,sll22l, r{454} ; cleavage {010} ; twin ptane(100). Pale rose crystals show: X (palerose) :[00i] : {0"'to t;; t, lpaler rose):[010];Z (palestrose); indices (Na): aX:1.694, ny:1.704, nZ:1.719; positive; 2V:75'; r(u. Dark rosecrystals are zonedl X (deeprose):[010i; Z (palerose): [001] :+12" to 20o;Z (palerrose); indices (Na): nX:1.725, nv:I.72g, nZ:t.755;positive; 2V:ffi'; r ( u.As nowdescribed, roselite is homeomorphous with brandtitd-ca;MnAsros '2H2O,as described by Aminofi(1919). Roseliteis anothercase in whichthe lattice with thehighest pseudo-symmetry (pseudo- orthorhombic)is a multiplelattice of the propercrystal lattice. In all suchcases the Rule of HighestPseudo-Symmetry gives unsatisfactory morphological elements and abnormal formsyrnbols. Pseudo-symmetry is one of the most remarkable facts of crystallog- raphy. with axial anglesapproaching 90oor 60" and axial lengths nearing equality, many crystal species of low real symmetry simulate higher symmetry in their geometrical elements. This metricall pseudo-symme- try of the morphological lattice is typically accompaniedby correspond- ing pseudo-symmetry in the arrangement and development of the forms, in the geometry of the diffraction patterns obtained with r-rays, and in the optical behaviour.
    [Show full text]
  • Talmessite from the Uriya Deposit at the Kiura Mining Area, Oita Prefecture, Japan
    116 Journal ofM. Mineralogical Ohnishi, N. Shimobayashi, and Petrological S. Kishi, Sciences, M. Tanabe Volume and 108, S. pageKobayashi 116─ 120, 2013 LETTER Talmessite from the Uriya deposit at the Kiura mining area, Oita Prefecture, Japan * ** *** Masayuki OHNISHI , Norimasa SHIMOBAYASHI , Shigetomo KISHI , † § Mitsuo TANABE and Shoichi KOBAYASHI * 12-43 Takehana Ougi-cho, Yamashina-ku, Kyoto 607-8082, Japan **Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan *** Kamisaibara Junior High School, 1320 Kamisaibara, Kagamino-cho, Tomada-gun, Okayama 708-0601, Japan † 2058-3 Niimi, Niimi, Okayama 718-0011, Japan § Department of Applied Science, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan Talmessite was found in veinlets (approximately 1 mm wide) cutting into massive limonite in the oxidized zone of the Uriya deposit, Kiura mining area, Oita Prefecture, Japan. It occurs as aggregates of granular crystals up to 10 μm in diameter and as botryoidal aggregates up to 0.5 mm in diameter, in association with arseniosiderite, and aragonite. The talmessite is white to colorless, transparent, and has a vitreous luster. The unit-cell parame- ters refined from powder X-ray diffraction patterns are a = 5.905(3), b = 6.989(3), c = 5.567(4) Å, α = 96.99(3), β = 108.97(4), γ = 108.15(4)°, and Z = 1. Electron microprobe analyses gave the empirical formula Ca2.15(Mg0.84 Mn0.05Zn0.02Fe0.01Co0.01Ni0.01)∑0.94(AsO4)1.91·2H2O on the basis of total cations = 5 apfu (water content calculated as 2 H2O pfu).
    [Show full text]
  • Wendwilsonite Ca2(Mg, Co)(Aso4)2 • 2H2O C 2001-2005 Mineral Data Publishing, Version 1
    Wendwilsonite Ca2(Mg, Co)(AsO4)2 • 2H2O c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Monoclinic. Point Group: 2/m. Crystals are stout prismatic, elongated along [100], showing {011}, {111}, {010}, {110}, to 6 mm. Twinning: On {100} as twin and composition plane; lamellar structure k{010}, {011}, {111} visible optically. Physical Properties: Cleavage: Perfect on {010}. Fracture: Uneven. Hardness = 3–4 D(meas.) = 3.52(8) D(calc.) = 3.57 Optical Properties: Transparent. Color: Pale to intense pink, may be red, commonly color zoned. Streak: Pale pink. Luster: Vitreous. Optical Class: Biaxial (–). Pleochroism: X = violet-pink; Y = rose-pink; Z = colorless. Orientation: Y = b; Z ∧ c =92◦. Dispersion: r< v. Absorption: X ≥Y > Z. α = 1.694(3) β = 1.703(3) γ = 1.713(3) 2V(meas.) = 87(2)◦ Cell Data: Space Group: P 21/c. a = 5.806(1) b = 12.912(2) c = 5.623(2) β = 107◦24(1)0 Z=2 X-ray Powder Pattern: Bou Azzer, Morocco; close to roselite. 2.994 (100), 2.766 (80), 3.226 (60), 5.085 (50), 3.356 (40), 2.592 (40), 3.397 (30) Chemistry: (1) (2) As2O5 55.8 52.76 CoO 2.6 8.60 MgO 7.7 4.63 CaO 26.4 25.74 H2O 7.4 8.27 Total 99.9 100.00 (1) Bou Azzer, Morocco; by electron microprobe, H2O by the Penfield method; corresponding to • • Ca2.03(Mg0.82Co0.15)Σ=0.97(AsO4)2.09 1.77H2O. (2) Ca2(Mg, Co)(AsO4)2 2H2O with Mg:Co = 1:1.
    [Show full text]
  • Dobšináite, Ca Ca(Aso ) ·2H O, a New Member of the Roselite Group from Dobšiná (Slovak Republic)
    Journal of Geosciences, 66 (2021), 127–135 DOI: 10.3190/jgeosci.324 Original paper Dobšináite, Ca2Ca(AsO4)2·2H2O, a new member of the roselite group from Dobšiná (Slovak Republic) Jiří SEJKORA*1, Martin ŠTEVKO2,1, Radek ŠKODA3, Eva VÍŠKOVÁ4, Jiří TOMAN4, Sebastián HREUS3, Jakub PLÁŠIL5, Zdeněk DOLNÍČEK1 1 Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Prague 9, Czech Republic; [email protected] 2 Earth Science Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic 3 Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic 4 Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37 Brno, Czech Republic 5 Institute of Physics, Academy of Sciences of the Czech Republic v.v.i, Na Slovance 2, 182 21 Prague 8, Czech Republic * Corresponding author Dobšináite, ideally Ca2Ca(AsO4)2·2H2O, is a new supergene mineral from the Dobšiná deposit, Slovak Republic, associ- ated with phaunouxite, picropharmacolite, erythrite-hörnesite, gypsum and aragonite. It forms white to pink clusters or polycrystalline aggregates up to 1–4 mm in size consisting of densely intergrown, slightly rounded thin tabular to platy crystals up to 0.1 mm in size. Dobšináite has a white streak, vitreous luster, does not fluoresce under either short- or long-wave ultraviolet light. Cleavage on {010} is good, the Mohs hardness is ~3, and dobšináite is brittle with an uneven fracture. The calculated density is 3.395 g/cm3. Dobšináite is optically biaxial negative, the indices of refraction are α´ = 1.601(2) and γ´ = 1.629(2) and 2Vmeas.
    [Show full text]
  • In-Situ X-Ray Photoelectron Spectroscopy and Raman Microscopy of Roselite Crystals, Ca2(Co2+,Mg)
    crystals Article In-Situ X-ray Photoelectron Spectroscopy and Raman 2+ Microscopy of Roselite Crystals, Ca2(Co ,Mg)(AsO4)2 2H2O, from the Aghbar Mine, Morocco Jacob Teunis Kloprogge 1,2,* , Barry James Wood 3,† and Danilo Octaviano Ortillo 2 1 School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia 2 Department of Chemistry, College of Arts and Sciences, University of the Philippines Visayas, Miagao, Iloilo 5023, Philippines; [email protected] 3 Centre for Microscopy & Microanalysis, The University of Queensland, Brisbane, QLD 4072, Australia; [email protected] * Correspondence: [email protected] † Deceased. 2+ Abstract: Roselite from the Aghbar Mine, Morocco, [Ca2(Co ,Mg)(AsO4)2 2H2O], was investigated by X-ray Photoelectron and Raman spectroscopy. X-ray Photoelectron Spectroscopy revealed a cobalt to magnesium ratio of 3:1. Magnesium, cobalt and calcium showed single bands associated with unique crystallographic positions. The oxygen 1s spectrum displayed two bands associated with the arsenate group and crystal water. Arsenic 3d exhibited bands with a ratio close to that of the cobalt to magnesium ratio, indicative of the local arsenic environment being sensitive to the substitution of magnesium for cobalt. The Raman arsenate symmetric and antisymmetric modes were all split with the antisymmetric modes observed around 865 and 818 cm−1, while the symmetric modes were Citation: Kloprogge, J.T.; Wood, B.J.; found around 980 and 709 cm−1. An overlapping water-libration mode was observed at 709 cm−1. Ortillo, D.O. In-Situ X-ray The region at 400–500 cm−1 showed splitting of the arsenate antisymmetric mode with bands at 499, Photoelectron Spectroscopy and 475, 450 and 425 cm−1.
    [Show full text]
  • Mg-Enriched Erythrite from Bou Azzer, Anti-Atlas Mountains, Morocco: Geochemical and Spectroscopic Characteristics
    Miner Petrol DOI 10.1007/s00710-017-0545-8 ORIGINAL PAPER Mg-enriched erythrite from Bou Azzer, Anti-Atlas Mountains, Morocco: geochemical and spectroscopic characteristics Magdalena Dumańska-Słowik1 · Adam Pieczka1 · Lucyna Natkaniec-Nowak1 · Piotr Kunecki2 · Adam Gaweł1 · Wiesław Heflik1 · Wojciech Smoliński1 · Gabriela Kozub-Budzyń1 Received: 17 March 2017 / Accepted: 31 October 2017 © The Author(s) 2017. This article is an open access publication Abstract Supergene Mg-enriched erythrite, with an aver- ores (Co arsenides, mainly skutterudite) and rock-forming age composition (Co2.25Mg0.58Ni0.14Fe0.04Mn0.02 Zn0.02) minerals (among others, dolomite) by the solutions in the (As1.97P<0.01O8)·8H2O, accompanied by skutterudite, roselite oxidation zone of the ore deposits. The heating of the Mg- and alloclasite, was identified in a pneumo-hydrothermal enriched erythrite up to 1000 °C leads to the crystallization quartz-feldspar-carbonate matrix within the ophiolite of the water-free (Co,Mg)3(AsO4)2 phase. sequence of Bou Azzer in Morocco. The unit cell param- eters of monoclinic Mg-enriched erythrite [space group Keywords Erythrite · Arsenate · Solid solution · Bou C2/m, a = 10.252(2) Å, b = 13.427(3) Å, c = 4.757(3) Å, ß Azzer · Morocco = 105.12(1)°] make the mineral comparable with erythrite from other localities. The composition of the sample rep- resents the solid solution between erythrite, hörnesite and Introduction annabergite, that is, the nearest to the endmember eryth- rite. However, Mg-enriched erythrite forming the crystal The mining region of Bou Azzer is located in Ouarzazate, exhibits variable compositions, especially in Mg and Co the southern province of Morocco, in the central belt of the contents, with Mg increasing from 0.32 up to 1.39 apfu, Anti-Atlas Mountains.
    [Show full text]
  • Systematic Raman Spectroscopic Study of the Isomorphy Between the Arsenate Minerals Roselite, Wendwilsonite, Zincroselite, Brandtite, and Rruffite
    Author Accepted Manuscript DOI: 10.1177/0003702820984254 Systematic Raman Spectroscopic Study of the Isomorphy Between the Arsenate Minerals Roselite, Wendwilsonite, Zincroselite, Brandtite, and Rruffite. Journal: Applied Spectroscopy Manuscript ID ASP-20-0302.R1 ManuscriptPeer Type: Submitted Review Manuscript Version Date Submitted by the 25-Nov-2020 Author: Complete List of Authors: Kloprogge, J.; University of the Philippines Visayas, Chemistry; The University of Queensland - Saint Lucia Campus, School of Earth and Environmental Sciences arsenate, roselite group, roselite, zincroselite, brandtite, wendwilsonite, Manuscript Keywords: rruffite, Raman spectroscopy In nature a wide variety of minerals are known with the general formula X2M(TO4)2·2(H2O) and an important group is formed by minerals with T = As. Most of these occur as minor or trace minerals in environments such as hydrothermal alterations of primary sulfides and arsenides. X- ray Photoelectron Spectroscopy (XPS) and Raman microspectroscopy have been utilized to study the chemistry and crystal structure of the roselite subgroup minerals, Ca2M(AsO4)2·2H2O (with M = Co, Mg, Mn, Zn, and Cu). The arsenate AsO4 stretching region exhibited minor differences between the roselite subgroup minerals, which can be explained by the ionic radius of the cation substituting on the M position in the structure. Multiple AsO4 antisymmetric stretching vibrations were found, pointing to a tetrahedral symmetry reduction. Similar observations were made for the corresponding bending modes. Bands around 450 cm-1 were attributed to ν4 bending modes. Several bands in Abstract: the 300–350cm-1 region attributed to ν2 bending modes also provide evidence of symmetry reduction of the AsO4 anion. Two broad bands for roselite were found around 3330 and 3120 cm-1 and were attributed to the OH stretching bands of crystal water.
    [Show full text]
  • Download the Scanned
    CLASSIFICATION OF MINERALS OF THE TYPE fu(XO a)2' nH2O ( Concluded) C. W. Wornn, Harvard. Uniaersity, Combri.d.ge,Mass. \LonnnuedJrjn pdge/)J) CoNrnNrs or Penr 2 Page The Ar(XOr)z 4HzO Family. 787 Parahcpeite .. 788 Anapaite 788 Messelite 790 Phosphophyllite 792 The Relations of Phosphophyllite to Hcpeite 79s Hopeite. 795 Trichalcite 799 The As(XOr)z SHrO Family 800 Choice of Unit Cell 800 Optical Properties 801 Chemistry , 801 Symplesite. 801 Vivianite. 803 Annabergite. 804 Erythrite. 804 K6ttigite. 804 Bobierrite 806 Iloernesite 806 Conclusions 807 Ack nowledgments. 808 Bibliography 808 fnn fu (XO+)z. 4HzO Fenrr,y This family is composed of the triclinic group-parahopeite and ana- paite; the monoclinic member phosphophyllite; and the orthorhombic member-hopeite. The relations between the unit cells of phosphophyl- lite and hopeite are simple and are given in the description of the former. Parahopeite and anapaite have very similar unit cells, their differences being due solely to the variation in cation content. The relation between the cells of the triclinic members and the monoclinic and orthorhombic membersis not clear. The addition of one or more molecules of water to each crystallizing molecule must be accompanied by a completely new bonding arrange- ment, for there is no recognizablerelation between the unit cells of the members of the various families and there is no single factor of the unit cells which varies with the water variation. Thus it is impossible to relate the unit cells of the various families, although there is a definite relation 787 788 C. W. WOLFE between the cell volumes and the number of water molecules.
    [Show full text]
  • Download the Scanned
    TNDEX TO VOLUME 21 Leading articles arq in bold face t5rpel notes, abstracts gnd re- views are in ordinary type. Only minerals for which definite data are given are indexed. Adamite from Chloride Cliff, Cali- Babingtonite and ePidote from fornia.(Murdoch).... 811 Westfield, Mass. (Palache).t93,652 Aguilarite from Comstock lode, Bacalite. (Buddhue). 269 Virginia City, Nevada.(Coats) 532 Baier, E. and Schmidt, W. Lehr- Ahlfeld,D...... 270 buch der Mineralogie. [Book Aidyrlite (Godlevsky) 269 reviewl. 267 Akermanite. lg3 Balk,R andKrieger,P.Devitrified Alexander,A. E. Locality for opal- felsite dikes from AscutneY ized spherules 266 Mt., Vermont 516 lgg Baltimorite ' 463 Allemontite, tc-ray study of. Barber,C. T.. 388 (Holmes) 202 Barite in red beds of Colorado. Allen, V. T. Dickite from St. Louis, (Ilowlantl). 584 Missouri. 457 Barth, T. F. W.. 204 Mineralized spherulitic Book review. 331 Iimestone in the Cheltenham Bastite. ....... 463 fireclay. 369 Bates limestone, Lewiston, Mainet Alling, H. L. Interpretative petrol- minerals in. (Fisher). .200,32t ogy of igneousrocks. [Book re- Beiyinite.(Ho)... 214 viewl.. 813 Bentonitic magnesian clay-min- Al-atoms in the two reaction series; eral. (Foshag' Woodford)'.. 238 role of. (Brammall). 268 Berman,H...... ....'..' 201 Amarillite. (Ungemach). 270 Bermanite, a new PhosPhater oc- Ammonium molybdo-ditellurate, curring with triPlite in Arizona. crystallography of. (Donnay, (Ilurlbut). 655 M6lon). 250 Berthierite' crystallographic data' Amygdaloidal dikes. (Moehlman). 329 unit cell atrd space group. Andalusite in pegmatite. (Mur- @uerger). .205,442 doch). 68 Bertrandite and epistilbite from Anderson,B. W.. l+0 Bedford,N. Y. (Pough)..... 264 Anorthite from Duke Island, Biographisch-literarisches Hand- Alaska.
    [Show full text]