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American Mineralogist, Volume 7l, pages845-847, 1986 NEW MINERAL NAMES'T FnaNx C. H,c,wrHoRNE,PETE J. DuNN, JoBr, D. Gnrco, Jlcnx Puzrnwtczo Jlvrns E. Snrcr,Bv Doyleite* G.Y. Chao, J. Baker, A.P. Sabina,A.C. Roberts (1985) Doyleite, An average of three typical microprobe analyses gave ZnO a new polymorph of Al(OH)r, and its relationship to bayerite, 19.75,CUO 0.02, FerO, 10.81, AlrO3 24.97, AsrO' 31.91, MoO, gibbsite, and nordstrandite. Can. Mineral., 23,21-28. 1.08, HrO (rce) 11.25, sum 99.79 wt0/0,corresponding to (Zno {(AsOJ (OH)r}, or ideally (Zn,Fe)- Doyleite is a new polymorph of AI(OH), that occurs at rrFeo,r)(Al,roFeo ro) | (Al,Fe)r{(AsO.) (OtDr}. Isomorphous replacement of (Zn,Fe) and Mont St. Hilaire and at the Francon quarry, Montreal, | Quebec, (Al,Fe) is indicated. The valence state ofFe is uncertain owing Canada.Wet chemical analysisgave NzO3 65.2,CaO 0.48, HrO to the small amount of pure material available. The mineral is (rcr to ll00'C) 35.76, sum 101.44 wlo/o,corresponding to insoluble in HCl. rce shows a dehydration reaction between 460 AlorrCa"o,(OH)roo.Trace amounts of Na, Fe, Mg, and Si were and 520t with a weight loss of approximately I I wto/o. detected by electron-microprobe analysis. The mineral is not Indexing of the X-ray powder data (Guinier camera) led to a attackedby 1:I HCl, HrSOo,or HNO3 at room temperature.rcA small triclinic cell with lattice constants a : 5.169(5), b : showed a weight loss of 25.630/obetween 280 and 410qCand a 13.038(9),c:4.93r(4) A, a:98.78(7f, B:100.80(6)",r: further gradual loss to I 000€, giving a total weight loss of 35 . 7 60/0. 78.73(6)',2:2.The spacegroup is uncercainowing to the lack The infrared spectrum showed bands due to OH-stretching (330G- of suitable singlecrystals for X-ray study. The strongestlines (38 3700 cm-'), OH-bending(700-1 100 cm-'), and AlO-stretching given) are 12.771(010X100),4.801(001)(40), 4.220(030X40), (20G{00 cm-') and is similar to but simpler than thoseofgibbs- 3.878( 1 I 1X50),3.63 | (02r,r2I), and 3.I 40(1I 1X50). ite or nordstrandite. The mineral occurs as a secondaryphase in deeply oxidized Single-crystal X-ray study shows the mineral to be triclinic, ore specimens from Tsumeb, Namibia. It forms spherulitic ag- spacegroup Pl or PI (PI from morphology),unit cell a : 5.002(I ), gregatesof tabular crystals up to 3 pm in size and approximately b : 5.r75(r), c : 4.980(2)A, a : 97.50(l)',0 : t I 8.60(l)", : r 1 pm in length. Associatedminerals include hematite, quartz, 104.74(lf, Z:2. The strongestlines (35 given) are scorodite,powellite, betpakdalite,and kaolinite. Gerdtremmelite 4.794(100X0 r 0), 2.360(40X I 0 t), t.972(30)(22 I 1.857(30X1I I ), ), is yellowish brown to dark brown. It is transparent with an ada- and r.8a2Q0)(122). mantine luster, a white streak, and no fracture or visible cleavage. At Mont St. Hilaire, doyleite occursas rosettesof platy crystals Mean refractive index 1.73-1.74, high birefringence.No fluo- with calcite and pyrite in a vug in albitite veins in nepheline rescenceunder ultraviolet light. D*" 3.66 g/cm3. syenite. At the Francon quarry, it is found sparingly in vugs with The name is for Dr. Gerd Tremmel who first recognized the weloganite,calcite, cryolite, qtafiz, and other minerals in sili- mineral. Type material is preserved at the University of Hei- cocarbonatitesills. Here it is finely Crystalsof doyleite $anular. delberg,Germany. J.E.S. are tabular on (010), showingforms {010}, {l0l}, {l0l-}, and occasionally{100} and {001}. They are white, creamy white to bluish white, transparentor translucent to opaque with a white streak.Luster vitreoqs, pearly or dull. H, 2Vy3. D,2.a8(l) (hV- Arsenogoyazite* drostatic suspension),Dd" 2.482 g/cm3. Cleavageis perfect on K. Walenta, P.J. Dunn (1984) Arsenogoyazit,ein neuesMineral {010}, fair on {100}. Inert to LW or SW fluorescentlight. Op- der Crandallitgruppe aus dem Schwarzwald. Schweiz. Mineral. ticallybiaxial, positive, a : 1.545(l),I : 1.553(l), : 1.566(l), r Petrogr.Mitt., 64, I l-19. 2V:77" (Na lUht). Moderately strong dispersion, r > y. The structure of doyleite is similar to gibbsite, bayerite, and Arsenogoyazite, a member of the crandallite group and the nordstrandite, with layers of AI(OHL octahedra. The polymor- arsenate analogue of goyazite, is a new mineral of secondary phism in AI(OH)3 is a result of different ways of stacking octa- origin from the Black Forest region of Germany. Microprobe hedral layers. analysisgaveSrO 10.1,CaO 2.8, BaO 6.5, FeO 0.2, Al2O330.9, The name is for Mr. E. J. Doyle who first found the mineral AsrO,25.3,PrO5 8.9, F 3.6,HrO (by difference)13.2, total 101.5, at Mont St. Hilaire. Type material is preserved at the National lessO: F 1.5,sum 100.00/0.This correspondsto (SronCa"rpa"r,- Museum of Natural Sciences,Ottawa, Ontario (NMNS 48932), Feoo,)- roAl, on[(AsO),,o(POo)o ur]r,.rr[(OH)o roFo *]r, . s'1.22H2O, at the Royal Ontario Museum, Toronto, Ontario (M41025), and or ideally, SrAl(AsO.)r(OH)s. HrO. at the Geological Survey of Canada,Ottawa, Ontario. J.E.S. X-ray study shows the mineral to be hexagonal, space group R3morR3z, unit cella:7.10,c:17.16 A,Z:3,or a^: 7.04 A, a : 60.60",Z : | (calcttlatedfrom the powder pattern). Gerdtremmelite* The strongestX-ray lines (22 gven) are 5.84(70)(1011),3.56(80) K. Schmetzer, O. Medenbach (1985) Gerdtremmelite, (1 1 20), 3.03( l 00)(022 r,r r23),2.3 | (40)(2r-3t), l. 93 3(50) (Zn,Fe)(Al,Fe),t(AsO)l(OH)r), a new mineral from Tsumeb, (3033,0333). Namibia. N. Jb. Miner. Mh.. no. l. l-6. The mineral forms crusts on quartz and barite in association with malachite, brochantite, olivenite, barium-pharmacosiderite, * Minerals marked with asterisks were approved before pub- and sulfate-free weilerite. The crusts have a renifofln appearance. lication by the Commission on New Minerals and Mineral Names Indistinct rhombohedronJike crystal faces can be observed on of the International Mineralogical Association. the surface of the crusts. In the case of small tabular crystals, 0003{04xl86/0506{845S02.00 845 846 NEW MINERALNAMES (0001) is also present.Arsenogoyazite is intimately intergrown n[(Mg,AlXOH)r]-A new mineral. Mineralog. Zhurnal, 6(5), with the weilerite in one instance.The mineral occursat the Clara 91-97 (in Russian). mine near Oberwolfach in the Central Black Forest. It is white, Microprobeanalysis (3 given)gave V 32.48,S 32.93,Mg 10.17, yellowish, or pale greento grayish gteen; translucent;luster vit- Al 5.66, O 19.89,H 1.26,sum 102.48(O and H calculatedon reous;with no cleavagebut conchoidal fracture.H about 4. D-*" the basis of structure). 3.35 + 0.05 g/cm3(hydrostatic suspension), D^.3.33 g/cm3. Electron diftaction study shows the mineral to have hybrid Mean index of refraction 1.64(variations within rangeof +0.03); structureconsisting ofbrucite la: 3.06(l), c: 11.3(1)Al and isotropic or weakly birefringent. sulfide a:3.20(l), c : ll.3(l) A] layers,analogous The name is for the chemical composition and the relationship [hexagonal, to valleriite. with goyazite. Type material is at the University of Stuttgart. X-ray diffraction pattern of the mineral was indexed on a hex- J.E.S. agonalcell (P3ml?, a = 3.21,c = ll.3 A). fne strongestX-ray lines (16 given, most of them broad) are 5.68(10X0002), 2.76(6X10I0),1.596(4Xll20), 1.575(6X1121,1016). IR spec- Phyllotungstite* trum of the mineral is discussed.The formula V'-"S' : given valleriite. K. Walenta (1984) Phyllotungstit, ein neues sekundiiresWol- n[(Mg,AlXOH),1(n 0.612) is by analogy with pinkish frammineral aus der Grube Clara im mittleren Schwarzwald. The color is violet; in reflectedlight, anisotropic;strong red N. Jb. Miner. Mh., 1984,no. 12,529-535. bireflectance. Isotropic sections and fragments are orange with weak lilac tint. Anisotropic fragments have tints from red Microprobe analysisgave CaO I .8, PbO 2. I, FerO, I 3.3, WO, lilac to pinkish dark gray. No internal reflections. In polarized 72.7, HrO (by difference) 10.1, sum 100.00/0,corresponding to light, strong red anisotropic effects,similar to those of covellite. Ca"u,Pbo,rFe!.f;Ws e3H2r 1rO34, or idea[y, CaFer]I(WOo)u'lOHrO. Reflectancemeasurements (nm, Roo/o)gave 440, 26.0; 46Q,22.4; X-ray study shows the mineral to be orthorhombic, spacegroup 480, 19.0;500, 17.6;520, 17.8; 540, 18.7; 560,20.7;580, 23.3; : P222,Pmm2, or Pmmm, unit cell a:7.29, b 12.59,c: 19.55 600,26.4; 620, 29.6; 640, 32.8; 660, 35.7; 680, 38.2;700, 40.1 ; A, Z:3. The strongest X-ray lines (50 given) are 720,41.5;740, 42.3. 6.33(70Xr r 0,020), 3.25(80X006), 3. r 3(I 00)(220,040,22r,04r), Very soft, plastic. Microhardness2-6'9.81 MPa (9.81 mN 2.92(70)(204,r34,r | 6), 2.45 (7 0)(225,045,008,05 2), and load),Mohshardness < l.
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    A SPECIFICGRAVITY INDEX FOR MINERATS c. A. MURSKyI ern R. M. THOMPSON, Un'fuersityof Bri.ti,sh Col,umb,in,Voncouver, Canad,a This work was undertaken in order to provide a practical, and as far as possible,a complete list of specific gravities of minerals. An accurate speciflc cravity determination can usually be made quickly and this information when combined with other physical properties commonly leads to rapid mineral identification. Early complete but now outdated specific gravity lists are those of Miers given in his mineralogy textbook (1902),and Spencer(M,i,n. Mag.,2!, pp. 382-865,I}ZZ). A more recent list by Hurlbut (Dana's Manuatr of M,i,neral,ogy,LgE2) is incomplete and others are limited to rock forming minerals,Trdger (Tabel,l,enntr-optischen Best'i,mmungd,er geste,i,nsb.ildend,en M,ineral,e, 1952) and Morey (Encycto- ped,iaof Cherni,cal,Technol,ogy, Vol. 12, 19b4). In his mineral identification tables, smith (rd,entifi,cati,onand. qual,itatioe cherai,cal,anal,ys'i,s of mineral,s,second edition, New york, 19bB) groups minerals on the basis of specificgravity but in each of the twelve groups the minerals are listed in order of decreasinghardness. The present work should not be regarded as an index of all known minerals as the specificgravities of many minerals are unknown or known only approximately and are omitted from the current list. The list, in order of increasing specific gravity, includes all minerals without regard to other physical properties or to chemical composition. The designation I or II after the name indicates that the mineral falls in the classesof minerals describedin Dana Systemof M'ineralogyEdition 7, volume I (Native elements, sulphides, oxides, etc.) or II (Halides, carbonates, etc.) (L944 and 1951).
  • Wei.Oganite, a New Strontium Zirconium Carbonate From

    Wei.Oganite, a New Strontium Zirconium Carbonate From

    WEI.OGANITE,A NEW STRONTIUMZIRCONIUM CARBONATE FROMMONTREAI ISLAND, CANADA ANN P.SABINA, J. L. JAMBORaNo A. G. PLANT GeologicalSurztey of Canad,a,Ottawa AssrRAcr Weloganite occurs in an alkalic sill which has intruded Ordovician limestone at St-Michel, Montreal Island, Quebec. Chemical analysis of the new mineral gave SrO41.0,2rOg19.4,CO232.2,H2O6.6, sum 99.2, corresponding to SrsZrzCs.aHe.aOaz.z, ideally SroZrzCsHeOar. Weioganite ittrigonal, spacegroup P31,2,hexagonal dimensionso : 8.96, c : 18.06A, D^ : 3.22, D" : 3.26 f.or Z :2. The strongest lines of the r-ray powder pattern are 2.81A (10),4.35 (9), 2.59 (7),2.2n Q),2.009 (7). The mineral occurspredominantlv as yellow crystals which are roughly hexagonal in outline and typically irregular in widtl. IurnooucrroN The new mineral weloganite was discovered during an investigation of mineral occurrences in the Montreal area in the summer of 1966. Weloganite occurs in an alkalic sill, 5 to 10 feet thick, which has intruded Trenton (Ordovician) limestone at St-Michel, Montreal Island, Quebec. The general geology has been described by Clark (1952) who regards the dykes and sills in the area as satellitic rocks genetically related to the plutonic alkalic intrusions forming the core of Mount Royal, one of the Monteregian Hills. The sill in which weloganite occurs is about four and a half miles north of Mount Royal and is well exposed in the limestone quarry operated by Francon (1966) Limit6e. A report on the petrology of the sill will be given at alater date by L.
  • Gold Mineralization in the Black Cloud #3 Carbonate Replacement Orebody, Leadville Mining District, Lake County, Colorado

    Gold Mineralization in the Black Cloud #3 Carbonate Replacement Orebody, Leadville Mining District, Lake County, Colorado

    Gold mineralization in the Black Cloud #3 carbonate replacement orebody, Leadville Mining District, Lake County, Colorado Item Type text; Thesis-Reproduction (electronic) Authors Gray, Matthew Dean, 1933- Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 30/09/2021 01:36:16 Link to Item http://hdl.handle.net/10150/558083 GOLD MINERALIZATION IN THE BLACK CLOUD #3 CARBONATE REPLACEMENT OREBODY, LEADVTLLE MINING DISTRICT, LAKE COUNTY, COLORADO by Matthew Dean Gray Copyright(g>Matthew Dean Gray 1988 A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fulfillment of the Requirements For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1988 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgement of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the copyright holder. APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: Professor of Geosciences ACKNOWLEDGMENTS The writer wishes to express his sincere appreciation to a number of individuals and organizations whose help and support made this thesis project possible and enjoyable.