DOCSLIB.ORG

Kunatite, Cufe (PO) (OR) °4R 0, a New Member of The

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Kunatite, Cufe (PO) (OR) °4R 0, a New Member of The Kunatite, CuFe (PO) (OR) °4R 0, a new 2 4 2 2 2 member ofthe whitmoreite group, from Lake Boga, Victoria, Australia. Stuart J. Mills Department of Earth and Ocean Sciences, University of British Columbia, Vancouver Be, Canada, V6T 1Z4 email: [email protected] Uwe Kolitsch Mineralogisch-Petrographische Abteilung, Naturhistorisches Museum, Burgring 7, A-10lO, Wien, Austria William D. Birch Department of Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia Jifi Sejkora Department of Mineralogy and Petrology, National Museum, Vaclavske nam. 68, CZ-1l5 79 Praha 1, Czech Republic ABSTRACT Kunatite, CuFe2(P04)2(OH)2'4HP, (IMA 2007--(57), is a newly defined mineral from a quarry in Late Devonian granite near Lake Boga, northern Victoria, Australia. The mineral occurs as acicular to lath-like microcrystals forming compact to slightly open spheres, hemispheres and flattened sprays up to about 0.25 mm across, with individual fibrous crystals up to 30 flm long and 5 flm thick. Kunatite is associated only with chalcosiderite-turquoise. The crystals are yellow-green with a pale yellow streak and are transparent; the lustre of the aggregates is silky and the estimated Mohs hardness is 3. Kunatite is monoclinic, P2/c, with a = 9.863(10), b = 9.661(6), c = 5.476(6) A, ~ = 92.45(3)°, V = 521.3(3) A3 and Z = 2. The calculated density, based on the empirical formula, is 3.063 3 • = ~ = = = g/cm Crystals are biaxial (-), with a 1.703(3), 1.742(4) and y 1.762(3), and 2Vca1c 70°. Orientation: Z-c, with straight extinction and slight pleochroism: X = very pale yellow (almost colourless), Y = pale yellowish, Z = yellowish. The strongest five powder-diffraction lines [d in A, (I/Io)' (hkl)] are: 9.849, (100), (100); 4.386, (90), (210); 6.892, (80), (110); 4.924, (80), (200); 2.697, (60), (320,002,230). Kunatite is a new member of the whitmoreite group and the phosphate-dominant analogue of arthurite. The name is derived from the Australian aboriginal words kunat kunat, meaning cotton weed (sp. Actinobole uliginosum). Kunatite also occurs at the Huber open pit, near Krasno in the Czech Republic. Raman spectra ofboth type and Czech kunatite and infrared spectra ofthe Czech kunatite are also presented. INTRODUCTION Kunatiteis anewsecondaryphosphatemineralbelongingto thewhitmoreite group.ItoccursintheLateDevonianLake Boga Granite in north-western Victoria, Australia (Mills et al., 2008a) amongst a diverse assemblage of secondary copper/ uranium phosphate minerals (Henry and Birch, 1988), including the three othernew speciesulrichite (Birch et aI., 1988; Kolitsch and Giester, 2001), bleasdaleite (Birch et al., 1999) and lakebogaite (Mills et aI., 2008b), as well as Tresco several other very rare phosphates including meurigite­ (Na) (Kampf et al., 2007), metanatroautunite (Mills, 2004) VICTORIA and a new polymorph of sampleite (Giester et aI., 2007). Mostofthesecondaryphosphatesoccurasmillimetre-sized crystals in miarolitic cavities and on joint planes in the granite exposed in a large quarry 10 km south-south-west of Lake Boga township (35° 33'8" S, 143° 38' E) (Figure 1). Thesecondaryphosphatesowetheirorigintocrystallisation from circulating groundwaters charged with P, U and Granite Cu that were derived from oxidation reactions affecting Quarry !2::r I .. primaryapatite-(CaF) (formerlyfluorapatite; Burke, 2008), I 2km uraninite and chalcopyrite in the uppermost levels of the exposed granite (Mills et al., 2008a). Figure 1: Map Australian Journal ofMineralogy Vol 14, No 1, June 2008 3 As well as kunatite, the whitmoreite group contains (Sejkora et aI., 2006). At this open pit, the apical quartz anothertwo phosphates (whitmoreiteandearlshannonite), and greisen part of a cupola of autometamorphosed whilst the related arsenates of the isotypic arthurite group Li-mica-topaz granite was mined for Sn and W ores. are arthurite, cobaltarthurite and ojuelaite. Several other Here, kunatite is associated with apatite-(CaF), isokite, inadequately described minerals which are likely to be triplite, chalcosiderite-turquoise, leucophosphite, members of these groups were reported by Sejkora et pharmacosiderite,whitmoreite,earlshannonite, kolbeckite, al. (2006). All of the minerals are rare, with arthurite the and several unknown minerals, including the F-analogue most common. The phosphate members occur mainly as of perhamite and Zn-Fe3+and Fe2+-Al dominant members late-stage minerals in granite pegmatites and greisens, of the whitmoreite group (see also below). whereas the arsenates are found mainly in oxidised zones above ore deposits. APPEARANCE AND PROPERTIES Kunatite was named for the rural district of Kunat around Kunatite from Lake Boga occurs as acicular to lath-like the town of Lake Boga. The mineral data and name were microcrystals thatare radiallyintergrownto form compact approved by the IMA Commission of New Minerals, to slightly openspheres, hemispheres andflattened sprays Nomenclature andClassification(CNMNC) inMarch2008 up to about 0.25 mm across (Figures 2 and 3). Individual prior to publication (IMA 2007-057). The name is derived fibrous crystals are up to 30 !--lm long and 5 !--lm thick. The from theAustralianaboriginalwordskunat kunat, meaning small size ofthe crystals and their indistinctoutlines made 'cottonweed' (inthis case thespeciesActinobole uligino5um, identificationofforms difficult. However, by analogy with which grows in the region). Type material is deposited in other minerals of the whitmoreite group, the crystals are the collection of Museum Victoria, Melbourne, Australia probably flattened on (100), so that prisms belonging to (M40728 and M43772). the [001] zone are likely to be present, as well as {100). The crystals are yellow-green with a pale yellow streak and are transparent; the lustre of the aggregates is silky. The OCCURRENCE Mohs hardness could not be measured but is estimated to be about 3, based on other members of the whitmoreite The new mineral was first found about 1990 by mineral group. As observed under the petrographic microscope, collector John Carey, who donated several specimens kunatite crystals are brittle with an irregular fracture; to Museum Victoria. At the time, the small amount of there is possibly one cleavage direction parallel to [001]. material hindered complete description of the mineral, The density could not be measured due to the small size even though it was recognised quite early as being an of the crystals, but was calculated to be 3.063 g/cm3 from analogue ofarthurite. Kunatiteoccursononly aboutseven the unit cell and empirical formula. or eight small (3 cm or less across) pieces ofgranite matrix, which may be the contents of a single miarolitic cavity. Kunatite crystals are biaxial (-), with a = 1.703(3), ~ = The only supergene mineral associated with kunatite is 1.742(4) and 'Y = 1.762(3), measured using white light; chalcosiderite-turquoise, which forms tiny blue-green 2V could not be measured but was calculated to be 70°. globules. Thin bladed crystals of manganoan ferberite Orientation: Z-c, with straight extinction within error occur on several of the specimens, but this is regarded as limits; optical orientation (+) (crystals are length slow). In an accidental association. The matrix minerals are smoky transmitted light crystals show slight pleochroism, from X quartz, white albite, cream orthoclase and muscovite. = very pale yellow (almost colourless), Y = pale yellowish, Z = yellowish. Dispersionis weak, characterunknown, and Kunatite has also been found in supergene altered there are slightly anomalous bluish interference colours. phosphate accumulations in the abandoned Huber open Absorption: Z>Y>X. The Gladstone-Dale compatibility pit, near Krasno (50° 06' N, 12° 48' E) in the Czech Republic index is 0.046, categorised as good. Table 1: Chemical composition of kunatite from Lake Boga. Constituent wt.% Range Ideal** Probe Standard CuO 16.08 14.66-17.29 16.88 copper ZnO 0.03 0-0.06 zinc CaO 0.05 0-0.13 wollastonite Fe20 3 27.56 26.62-29.05 33.88 hematite Al20 3 0.56 0.38-0.76 corundum P20S 22.96 22.12-25.42 30.12 apatite-(CaF) As20, 5.14 4.59-5.68 arsenopyrite HO' . 2 (calc.) 16.61 19.12 Total 88.99 100.00 *H20(calc) content calculated on the basis of the ideal "whitmoreite"-type formula (H20 = 4) and charge balance. ** Theoretical composition calculated from the ideal formula CuFe3+2(P04)2(OH)2·4Hp 4 Australian Journal ofMineralogy Vol 14, No 1, June 2008 Figure 2: Radiating aggregates of yellow-green kunatite crystals on quartz from Lake Boga, Victoria. Museum Victoria specimen (M43772). Photograph by Lucy Gibson and Bill Birch. Field of view about 3 mm. At the Huber open pit, kunatite was found in cavities expected from the stoichiometry of other members of the of strongly altered original triplite accumulations in whitmoreitegroup. Thisphenomenonhasbeen reportedby several morphological types (Sejkora et al. 2006). It forms other authors for membersofthe whitmoreite andarthurite abundantbrightyellow-green radiatingto semi-spheroidal groups (Raudsepp and Pani, 2002). Raman spectroscopy aggregates up to 1 mm (K1 type; Figure 4) composed of (see below) showed no carbonate bands, so no CO, would brittlevery thin tabularcrystals to 0.5 mmlong and yellow­ be expected in the analyses. - green, well-formed elongate tabular to flattened acicular crystals up to 0.2 mm in length (K2 type; Figures 5 and To overcome this problem, the empirica1formula has been 6), or light yellowish green, six-sided tabular aggregates calculated on the basis of the stoichiometric whitmoreite up to 0.3 mm composed or fibre-like tabular crystals (K3 formula with 14 anions (setting 4 HoO) and taking into type; Figure 7). account the contents of non-essential elements. This yields the formula: CHEMICAL COMPOSITION Chemical analyses (7) of Lake Boga kunatite were carried Density and Gladstone-Dale factors were calculated out by means of an electron microprobe (CAMECA SX50, using this empirical formula. The simplified formula is WDS mode, 15 kY, 25 nA, 5 [lin beam diameter) at the CuFe)+/PO)2(OH)2·4Hp, which requires CuO16.88, Fep, University of Melbourne.
Load more

Recommended publications
  • The Atomic Arrangement of Ojuelaite, Znfe~ + (AS04)2(OH)204H20
    SHORT COMMUNICATIONS 519 MINERALOGICAL MAGAZINE, JUNE 1996, VOL. 60, PP 519-521 The atomic arrangement of ojuelaite, ZnFe~ + (AS04)2(OH)204H20 John M. Hughes Department of Geology, Erich S. Bloodaxe Miami University, Kyle D. Kobel Oxford, OR 45056, USA John W. Drexler Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA OJUELAITEwas described from its occurrence at the site in whitmoreite (Moore et at., 1974). Refinement Ojuela mine in Mapimi, Mexico by Cesbron et al. of electron occupancy of the site yielded 28.0 (1981). Those authors suggested that the phase was electrons, as opposed to 29.0 by electron probe, isostructural with whitmoreite (Moore et at., 1974), a supporting the lack of saturation of the site by Zn. It phase of interest because of the unique arrangement of is not known if the iron in the site is Fe2+ or if it is Fe octaheda in its octahedral sheet. Cesbron et at. Fe3+ that is charge-balanced by a mechanism such as (OH) substitution. (1981) also suggested that ojuelaite was isostructural a concomitant 0 =<== with arthurite, CuFd+(As04h(OHh.4H20 (Keller and Table 2 lists atomic coordinates, equivalent Hess, 1978). The common fibrous habit of ojuelaite, isotropic thermal parameters, and bond valence however, has precluded structure determination. sums before hydrogen bonding is calculated; We obtained a specimen of ojuelaite from the type Table 3 lists selected bond lengths. Structure locality that provided a single crystal suitable for factors and anisotropic thermal parameters may be structure determination. The structure study obtained from the editor. confirmed that ojuelaite is isostructural with whitmoreite and arthurite within the large constraints imposed by the requirements of the different TABLE 1.
    [Show full text]
  • Mineral Processing
    Mineral Processing Foundations of theory and practice of minerallurgy 1st English edition JAN DRZYMALA, C. Eng., Ph.D., D.Sc. Member of the Polish Mineral Processing Society Wroclaw University of Technology 2007 Translation: J. Drzymala, A. Swatek Reviewer: A. Luszczkiewicz Published as supplied by the author ©Copyright by Jan Drzymala, Wroclaw 2007 Computer typesetting: Danuta Szyszka Cover design: Danuta Szyszka Cover photo: Sebastian Bożek Oficyna Wydawnicza Politechniki Wrocławskiej Wybrzeze Wyspianskiego 27 50-370 Wroclaw Any part of this publication can be used in any form by any means provided that the usage is acknowledged by the citation: Drzymala, J., Mineral Processing, Foundations of theory and practice of minerallurgy, Oficyna Wydawnicza PWr., 2007, www.ig.pwr.wroc.pl/minproc ISBN 978-83-7493-362-9 Contents Introduction ....................................................................................................................9 Part I Introduction to mineral processing .....................................................................13 1. From the Big Bang to mineral processing................................................................14 1.1. The formation of matter ...................................................................................14 1.2. Elementary particles.........................................................................................16 1.3. Molecules .........................................................................................................18 1.4. Solids................................................................................................................19
    [Show full text]
  • THE CRYSTAL STRUCTURE of COBALTARTHURITE, Co2+Fe3+ 2
    733 The Canadian Mineralogist Vol. 40, pp. 733-737 (2002) THE CRYSTAL STRUCTURE OF COBALTARTHURITE, 2+ 3+ Co Fe 2(AsO4)2(OH)2•4H2O: A RIETVELD REFINEMENT MATI RAUDSEPP§ AND ELISABETTA PANI Department of Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada ABSTRACT The crystal structure of cobaltarthurite from near Pastrana, southeastern Spain [monoclinic, a 10.2694(4), b 9.6790(3), c 5.5723(2) Å, ␤ 94.277(2)°, P21/c], has been refined to Rwp and RB indices of 7.7 and 1.7%, respectively, using the Rietveld method and X-ray powder-diffraction data. Cobaltarthurite is a newly discovered Co-dominant analogue of arsenate members of 2+ 3+ the arthurite group, with ideal formula Co Fe 2(AsO4)2(OH)2•4H2O. Results of the Rietveld refinement confirm that cobaltarthurite is isostructural with other members of the group. Electron-probe micro-analyses show that the formula is of ideal stoichiometry, with minor substitution of Mg, Mn, Ni, Cu and Ca for Co, and trace P and S substitution for As. Keywords: cobaltarthurite, arsenate, chemical analysis, arthurite group, crystal structure, Rietveld refinement, X-ray powder- diffraction. SOMMAIRE Nous avons affiné la structure cristalline de la cobaltarthurite découverte près de Pastrana, dans le sud-est de l’Espagne [monoclinique, a 10.2694(4), b 9.6790(3), c 5.5723(2) Å, ␤ 94.277(2)°, P21/c] selon la méthode de Rietveld utilisée avec des données en diffraction X, jusqu’à des indices de concordance Rwp et RB de 7.7 and 1.7%, respectivement.
    [Show full text]
  • Download the Scanned
    THE AMERICAN MINER.{LOGIST, VOL. 55, SEPTEMBER-OCTOBER, 1970 NEW MINERAL NAN4ES Polarite A. D GnNrrrv, T. L EvsrrcNrEVA, N. V. Tnoxnve, eno L. N. Vver.,sov (1969) polarite, Pd(Pb, Bi) a new mineral from copper-nickel sulfide ores.Zap. Vses.Mined. Obslrch. 98, 708-715 [in Russian]. The mineral was previouslv described but not named by cabri and rraill labstr- Amer. Mineral.52, 1579-1580(1967)lElectronprobeanalyseson3samples(av.of 16, 10,and15 points) gave Pd,32.1,34.2,32 8; Pb 35.2, 38.3,34 0; Bi 31.6, 99.1,334; sum 98 9, 102.8, 100.2 percent corresponding to Pcl (Pb, Bi), ranging from pd1.6 (pb04? Bi0.60)to pdro (PboogBio rs). X-ray powder daLa are close to those of synthetic PbBi. The strongest lines (26 given) are 2 65 (10)(004),2.25 (5)(331),2.16 (9)(124),1.638(5)(144). These are indexed on an orthorhombic cell with a7 l9l, D 8 693, c 10.681A. single crystal study could not be made. In polished section, white with 1'ellowish tint, birefringence not observed. Under crossed polars anisotropic with slight color effects from gray to pale brown Maximum reflectance is given at 16 wave lengths (t140 740 nm) 56.8 percent at 460 nm; 59.2 at 540; 59.6 at 580; 6I.2 at 660. Microhardness (kg/mmr) was measured on 3 grains: 205,232, av 217;168- 199, av 180; 205-232, av 219. The mineral occurs in vein ores of the'r'alnakh deposit amidst chalcopyrite, talnekhite, and cubanite, in grains up to 0.3 mm, intergro.wn with pdspb, Cupd6 (Sn, pb): (stannopal- ladinite), nickeloan platinum, sphalerite, and native Ag The name is for the occurence in the Polar urals.
    [Show full text]
  • Coralloite, Mn2+Mn23+(Aso4)2(OH)2⋅4H2O, a New Mixed
    American Mineralogist, Volume 97, pages 727–734, 2012 2+ 3+ Coralloite, Mn Mn2 (AsO4)2(OH)2·4H2O, a new mixed valence Mn hydrate arsenate: Crystal structure and relationships with bermanite and whitmoreite mineral groups ATHOS MARIA CALLEGARI,1,* MASSIMO BOIOCCHI,2 MARCO E. CIRIOTTI,3 AND CORRADO BALESTRA4 1Dipartimento di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, via Ferrata 1, I-27100 Pavia, Italy 2Centro Grandi Strumenti, Università degli Studi di Pavia, via Bassi 21, I-27100 Pavia, Italy 3Associazione Micromineralogica Italiana, via San Pietro 55, I-10073 Devesi-Ciriè, Italy 4Associazione Micromineralogica Italiana, via Delfino 74, I-17017 Millesimo, Italy ABSTRACT Coralloite is a new mineral found at the Monte Nero Mine (Rocchetta Vara, La Spezia, Liguria, 2+ 3+ Italy) having the simplified formula Mn Mn2 (AsO4)2(OH)2·4H2O. It occurs as sub-millimetric lamellar cinnabar-red crystals elongated on [100] and flattened on (001), isolated or forming wisps up to 0.5–1 mm long. Associated phases are calcite, inesite, quartz, brandtite, sarkinite, and tilasite in a chert matrix. Crystals are pleochroic, yellow along [100] and orange-red in directions normal to it. Extinction is parallel to the cleavage traces and elongation is negative. The small crystal size does not allow accurate determination of refraction indices. Crossed polar observations of crystals placed in diiodomethane (n = 1.74) suggest that the mean refractive index is close to that value. Coralloite is triclinic, space group P1, a = 5.5828(7), b = 9.7660(13), c = 5.5455(7) Å, α = 94.467(3), β = 111.348(2), γ = 93.850(2)°, V = 279.26(6) Å3, Z = 1.
    [Show full text]
  • Cobaltarthurite Co2+Fe3+ 2(Aso4)2(OH)2·4H2O
    2+ 3+ Cobaltarthurite Co Fe 2(AsO4)2(OH)2·4H2O Crystal Data: Monoclinic. Point Group: 2/m. As globular to coalesced pellet-like aggregates, to 1.5 mm, comprised of fibrous crystals, to 75 µm. Physical Properties: Cleavage: None observed. Tenacity: Brittle. Hardness = 3.5-4 D(meas.) = 3.22(2) D(calc.) = 3.33 Readily soluble in 1:1 HCl. Optical Properties: Translucent. Color: Straw-yellow (exterior) to dark brown (core). Streak: White to light brown. Luster: Vitreous (crystals); silky (tufts). Optical Class: Biaxial (+). α = 1.741 β = 1.762 γ = 1.797 2V(calc.) = 77° Orientation: Z = ~c. Pleochroism: Distinct, X = colorless, Z = medium yellow. Absorption: Z > X, Y. Parallel extinction and length slow. Cell Data: Space Group: P21/c. a = 10.2635(9) b = 9.7028(8) c = 5.5711(5) β = 94.207(1)° Z = 2 X-ray Powder Pattern: Dolores showing, near Pastrana, Province of Murcia, southeastern Spain. 7.04 (100), 10.2 (95), 4.81 (65), 4.24 (60), 2.87 (55), 2.89 (25), 4.51 (20) Chemistry: (1) MgO 0.89 MnO 1.14 CoO 7.06 CuO 0.20 Fe2O3 31.88 As2O5 42.57 P2O5 0.56 SO3 0.07 H2O [16.64] Total 101.01 (1) Dolores showing, near Pastrana, Province of Murcia, southeastern Spain; by electron microprobe, average of 10 analyses, H2O calculated; corresponding to 3+ 3+ (Co0.50Mg0.12Fe 0.11Mn0.08Cu0.01 0.11)Σ=0.93Fe 2[(AsO4)1.95(PO4)0.04(SO4)0.01]Σ=2.00(OH)1.74·4H2O. Mineral Group: Arthurite group.
    [Show full text]
  • Raman Spectroscopic Study of the Mixed Anion Sulphate-Arsenate Mineral Parnauite Cu9[(OH)10|SO4|(Aso4)2].7H2O
    QUT Digital Repository: http://eprints.qut.edu.au/ This is the post-print, accepted version of this paper. Published as: Frost, Ray L. and Cejka, Jiri and Keeffe, Eloise C. and Sejkora, Jiri (2009) Raman spectroscopic study of the mixed anion sulphate-arsenate mineral parnauite Cu9[(OH)10|SO4|(AsO4)2].7H2O. Journal of Raman Spectroscopy, 40(11). pp. 1546-1550. © Copyright 2009 John Wiley & Sons, Ltd. Raman spectroscopic study of the mixed anion sulphate-arsenate mineral parnauite . Cu9[(OH)10|SO4|(AsO4)2] 7H2O Ray L. Frost 1 • Jiří Sejkora, 2 Jiří Čejka 1, 2 and Eloise C. Keeffe 1 1 Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia. 2 National Museum, Václavské náměstí 68, CZ-115 79 Praha 1, Czech Republic. The mixed anion mineral parnauite Cu9[(OH)10|SO4|(AsO4)2] 7H2O has been studied by Raman spectroscopy. Characteristic bands associated with arsenate, sulphate, hydroxyl units are identified. Broad bands are observed and are resolved into component bands. Two intense bands at 859 -1 3- and 830 cm are assigned to the ν1 (AsO4) symmetric stretching and ν3 3- (AsO4) antisymmetric stretching modes. The comparatively sharp band at -1 2- 976 cm is assigned to the ν1 (SO4) symmetric stretching mode and a broad -1 2- spectral profile centered upon 1097 cm is attributed to the ν3 (SO4) antisymmetric stretching mode. A comparison of the Raman spectra is made with other arsenate bearing minerals such as carminite, clinotyrolite, kankite, tilasite and pharmacosiderite. KEYWORDS: parnauite, strashimirite, arsenate minerals, Raman spectroscopy, sulphate, hydroxyl, molecular water • Author to whom correspondence should be addressed ([email protected]) 1 INTRODUCTION Parnauite Cu9(AsO4)2(SO4)(OH)10·7H2O is an uncommon mixed anion mineral containing both sulphate and arsenate 1-3 .The mineral is probably orthorhombic with point group 2/m 2/m 2/m 4.
    [Show full text]
  • Ojuelaite Znfe (Aso4)
    3+ • Ojuelaite ZnFe2 (AsO4)2(OH)2 4H2O c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Monoclinic. Point Group: 2/m. Acicular crystals or fibers, elongated k [001], to 4 mm, commonly in divergent sprays. Physical Properties: Cleavage: On {010}, observable. Hardness = 3 D(meas.) = 3.39 D(calc.) = 3.39 Optical Properties: Semitransparent. Color: Chartreuse to pale yellow-green. Streak: Pale yellow. Luster: Silky to vitreous. Optical Class: Biaxial (+). Pleochroism: In yellows. Orientation: X =b;Z = c. Absorption: Z = X > Y. α = 1.696 β = 1.730 γ = 1.798 2V(meas.) = n.d. 2V(calc.) = 73◦ Cell Data: Space Group: P 21/c. a = 10.237(1) b = 9.662(3) c = 5.562(1) β =94.36(1)◦ Z=2 X-ray Powder Pattern: Ojuela mine, Mexico. 4.251 (100), 2.871 (90), 7.03 (82), 4.83 (78), 10.23 (65), 2.630 (63), 2.901 (62) Chemistry: (1) (3) As2O5 40.5 40.97 Fe2O3 27.5 28.47 ZnO 14.6 14.51 H2O 16.8 16.05 Total 99.4 100.00 (1) Ojuela mine, Mexico; Zn and Fe by AA, As by UV spectrophotometry, H2O by the 3+ • Penfield method; corresponds to Zn1.02Fe1.96(AsO4)2.00(OH)1.92 3.37H2O. (2) Do.; by 2+ electron microprobe, analysis not given, stated to correspond to (Zn0.77Fe0.23)Σ=1.00 3+ • • Fe2.00(AsO4)1.94(OH)2 3.75H2O. (3) ZnFe2(AsO4)2(OH)2 4H2O. Mineral Group: Arthurite group. Occurrence: A rare mineral in the oxidized zone of arsenic-rich polymetallic hydrothermal ore deposits.
    [Show full text]
  • The Beauty Microscopic Mineral Deposits in Southeastern Spain / Luis Arrufat Milán Centro De Profesores De Cehegín
    Seminario_10_2013_d 10/6/13 17:11 Página 05 The beauty microscopic mineral deposits in Southeastern Spain / Luis Arrufat Milán Centro de Profesores de Cehegín. c/Begastri s/n. 30430 Cehegín (Murcia), Spain. [email protected] Abstract The stacking of different focal planes process is featured below in order to solve the problem about depth of field in photomicrography of minerals. Due to the variety of mineral species, and therefore, the great variety of crystals, different lighting techniques are needed. Hence, those lighting system used for the enhancement of the specific characteristics of each mine- ral, are explained as well in this article. The stacking technique is for some time now used in microscopy optics to get high-resolution images. Excellent results have been obtained in many different science fields. Thus, stacking becomes a perfect tool for scientific illustration. Finally, different samples of some crystallised minerals, appeared from the southeast of the Betican mountain range, are presented. In addition, a opinion about collecting minerals and about the preservation of the natural heritage is expressed. Resumen A continuación, se presenta el proceso de apilar distintos planos de enfoque fotográfico para resolver el problema de la profundidad de campo en la fotomicrografía de minerales. Así mismo se explica el método empleado para fotografiar cristales de distintas especies mine- rales, utilizando para ello sistemas adecuados de iluminación que permiten realzar las carac- terísticas particulares de cada mineral. Este procedimiento se utiliza desde hace algún tiem- po para obtener imágenes de gran resolución con microscopía óptica dando muy buenos resultados en muchos campos de la ciencia, con lo que se convierte en un instrumento per- fecto para la ilustración científica.
    [Show full text]
  • THE VARIETY of FAHLORES and the EPIGENETIC MINERALS from the LEBEDINOE DEPOSIT Svetlana N
    34 New Data on Minerals. 2011. Vol. 46 THE VARIETY OF FAHLORES AND THE EPIGENETIC MINERALS FROM THE LEBEDINOE DEPOSIT Svetlana N. Nenasheva, Leonid A. Pautov, Vladimir Y. Karpenko Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, [email protected] The new results of the mineralogical study of the Lebedinoe deposit are discussed. In addition to Zn-bear- ing tetrahedrite (sandbergerite), tetrahedrite-tennantite, and tennantite (Nenasheva et al., 2010), Te-bear- ing fahlores (goldfieldite-tennantite-tetrahedrite, goldfieldite-tennantite, and Te-bearing tennantite-tetra- hedrite), tetrahedrite with significant Ag, and anisotropic tetrahedrite-tennantitewere identified. These minerals were found in varied assemblages, whose mineral composition indicate the conditions of ore for- mation: the composition of mineral-forming fluid, temperature, and pH value. The chalcocite polysomatic series minerals, digenite, anilite, spionkopite, and yarrowite, used as geothermometer were discovered in the ores. 7 figures, 9 tables, 17 references. Keywords: fahlores, bournonite, hessite, petzite, anilite, spionkopite, yarrowite, bayldonite, clinotyrolite, strashimirite, leogangite, Lebedinoe deposit. Introduction CamScan-4D scanning electron microscope equipped with a Link ISIS energy dispersion Nenasheva et al. (2010) characterized in system (EDS) operating at 20 kV and current detail the Lebedinoe deposit. The deposit is absorbed at metallic cobalt of 4 nA. The X-ray reported according to Fastalovich and Pet - powder diffraction patterns were recorded at rovskaya (1940) and Petrovskaya (1973). an URS-50 diffractometer with an RKD Below is very brief description of the deposit. 57.3 mm camera, FeKaradiation, Mn filter. Weakly metamorphosed Cambrian dolomite The sample was selected from thin polished overlapping eroded granite is intruded by section and mount in resin ball.
    [Show full text]
  • New Naturally Occurring Mineral Phases from the Krásno – Horní
    Journal of the Czech Geological Society 51/12(2006) 159 New naturally occurring mineral phases from the Krásno Horní Slavkov area, western Bohemia, Czech Republic Nové minerální fáze z oblasti Krásno Horní Slavkov, západní Èechy, Èeská republika (43 figs, 21 tabs) JIØÍ SEJKORA1 RADEK KODA2 PETR ONDRU3 1 Department of Mineralogy and Petrology, National Museum, Václavské nám. 68, CZ-115 79 Prague 1, Czech Republic 2 Institute of Earth Sciences, Faculty of Science, Masaryk University, Kotláøská 2, CZ-611 37, Brno, Czech Republic 3 Biskupský dvùr 2, CZ-110 00 Prague 1, Czech Republic This paper presents description of eleven phases probably new mineral species from Krásno Horní Slavkov, western Bohemia, Czech Republic. The phases characterized are mainly supergene phosphates. All up-to-now available physical and chemical data for individual phases and references to appropriate literature are given. Key words: new natural phases; supergene minerals; phosphates; Krásno; Horní Slavkov; Czech Republic Introduction University, Prague) with XCelerator detector, with sec- ondary monochromator, using CuKá radiation at 40 kV In the course of the prolonged study of mineralization in and 30 mA. the Horní Slavkov Krásno ore district, presented in this The results were processed using X-ray analysis soft- issue of the Journal (Beran Sejkora, 2006; Pláil et al. ware ZDS for DOS (Ondru 1993), Bede ZDS Search/ 2006; Sejkora et al. 2006a, b, c), eleven new mineral Match ver. 4.5 (Ondru Skála 1997); unit-cell parame- phases have been encountered. This contribution presents ters were refined by program of Burnham (1962) and by the results of study of these phases.
    [Show full text]
  • Bendadaite, a New Iron Arsenate Mineral of the Arthurite Group
    Mineralogical Magazine, June 2010, Vol. 74(3), pp. 469–486 Bendadaite, a new iron arsenate mineral of the arthurite group 1,2, 3 4 5 6 U. KOLITSCH *, D. ATENCIO ,N.V.CHUKANOV ,N.V.ZUBKOVA ,L.A.D.MENEZES FILHO , 3 7 8 9 10 11 12 J. M. V. COUTINHO ,W.D.BIRCH ,J.SCHLU¨ TER ,D.POHL ,A.R.KAMPF ,I.M.STEELE ,G.FAVREAU , 2 13 2 5 L. NASDALA ,S.MO¨ CKEL ,G.GIESTER AND D. YU.PUSHCHAROVSKY 1 Mineralogisch-Petrographische Abt., Naturhistorisches Museum, Burgring 7, A-1010 Wien, Austria 2 Institut fu¨r Mineralogie und Kristallographie, Universita¨t Wien, Althanstr. 14, A-1090 Wien, Austria 3 Instituto de Geocieˆncias, Universidade de Sa˜o Paulo, Rua do Lago, 562, 05508À080, Sa˜o Paulo, SP, Brazil 4 Institute of Problems of Chemical Physics, 142432 Chernogolovka, Moscow Oblast, Russia 5 M.V. Lomonosov Moscow State University, Faculty of Geology, Vorobjovy Gory, 119899 Moscow, Russia 6 Instituto de Geocieˆncias, Universidade Federal de Minas Gerais, Av. Antoˆnio Carlos, 6627, 3127–901, Belo Horizonte, MG, Brazil 7 Department of Mineralogy, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia 8 Mineralogisches Museum, Universita¨t Hamburg, Grindelallee 48, D-20146 Hamburg, Germany 9 Mineralogisch-Petrographisches Institut, Universita¨t Hamburg, Grindelallee 48, D-20146 Hamburg, Germany 10 Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA 90007, USA 11 Senior Research Associate, Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue, Chicago IL 60637, USA 12 421 av. Jean Monnet, F-13090 Aix-en-Provence, France 13 Neudorfer Str.
    [Show full text]