DOCSLIB.ORG

VOLBORTHITE from BRITISH COLUMBIA J. L. Jeueox, Ot'tawa

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
VOLBORTHITE from BRITISH COLUMBIA J. L. Jeueox, Ot'tawa NOTES AND NEWS 1307 RrrnnaNcss Amxaxorn, G. B., HosroN, W. M., arn h,rn, H. K' (1954) The solubility of amorphous silica in water: -f. Phys. Chem.58,453-455. Cr-anrr', C. w (1924) The data of geochemistry : LI' S ' Geol' Suney BuIl' 77o' 841 p' CoNn.tr, T. A. (1346) Observations on the geology of East Floricla: Am. Jour' Sci',ser 2, 2, 36-48. CoorB, C. Wvrnr, aNo Mossou, Sruanr (1929) Geology of Florida: Florida State Geol Survey 20th annual rpt ,227 p. Kn.Lusrorn, KoNnm B. (1956) Dissolution and precipitation of silica at low tempera- tures'. Geockim. et Cosmochim Acta 10, l-26. Smvrn, RevuoNn (1957) The silica budget in the sedimentary cycle: Am. Minerol' 42, 821-841. Wnrrr, Donnrr E., Bna.NNocH,W. W., AND MuRArA, K J. (1956) Silica in hot spring waters: Geochim.et Cosmoclti'tn.AcLa lO,27-59. THE AMERITAN MINERALOGIST. VOL 1.5,NOVEMBER DECEMBER, 1960 VOLBORTHITEFROM BRITISH COLUMBIA J. L. Jeueox, Ot'tawa,Canada' Volborthite,Cue(VOa)z'3HzO, is presentas a weatheringproduct of a thin, interlava sedimentaryrock of Upper Triassic age which crops out west of \Ienzies Bay on Vancouver Island, and north of Gowland Har- bour on QuadraIsland, British Columbia. The vanadium-bearingrock is a black, extremelyfinely laminated,fos- siliferous,non-clastic sediment which consistschiefly of carbonaceous matter and microcrystallineto cryptocrystallinequartz. Spectrographic analysesindicate that the carbonaceousmaterial contains vanadium. Hypogene chalcociteis generallyan additional major constituent of the sediment,in somecases making up over 50/6 of the rock. The associated volcanic flows are predominantly pillowform and massive porphyritic basalts,andesites, and spilites which are commonly amygdaloidal.The amygdule material is largely qtartz, calcite, chlorite' zeolites,epidote, and pumpellyite. Prehnite, chalcocite,chalcopyrite, bornite, and native copper,as amygdule filiings, are widespreadin small amounts; analcite' heulandite,and greenockiteare of rare occurrence. Minor quantitiesof volborthite coat exposedsurfaces of the laminated sediment, but the mineral is more abundant along planes exposedby splitting the rock along the laminae. Pnvsrc.qr PnoprntrBs The vanadate assumesmany colors and habits, most of which are briefly summarizedbelow: 1308 NOTESAND NEWS Dark green to yellowish green, habit massive, compact, with good cleavage.Scaly crusts and rosette-like,honey-combed, or boxwork-like aggregates.Scales with a triangular or hexagonaloutiine, occasionally with impurities some distancefrom the center arrangedin a hexagonal outline. Scaly bright yellow to brownishyellow incrustationson massive or cleavableemerald green to dark greenhexagonal cores of up to 0.6 mm. diameter. Yellow, brownish yellow, light brown, and blackish brown, with habit flocculentorreticulated;also radiating fibrousand circular in outline, occurringsingly or in groups,usually with a successionof colored zonesand a minute, massive,central teat. Less commonly bright yellow and spherulitic. Most of the British Columbia volborthite is yellow or brownishyellow. The mineral is translucentin immersionoil, and not pleochroic.Lamellar twinning is common; the units are length fast and are twinned in a plane almost perpendicularto perfect (001) cleavage.Rare plaid twinning was also observed. The measured indices, determined on yellowish green scalesand cleavagefragments, depart greatly from thosereported in the literature: a 1.793+ .005 Biaxial negative p 1.801+ .005 (-) 2Vlarge r 1.816+ .005 r <a Dilute acids readily attack the mineral, turning it reddish-brownand leaving a clear silicaresidue. The results of severalspectrographic anal- ysesare given in Table I. Abundant water is yielded in the closedtube. T.lelr 1. SprcrnocnepnrcAr.rnrvsns ol B.C. Vor-nonrnrrn Habit Minor Strong trace Flocculent Cu, V Si, AI Ca Flocculent Cu,V Ai si, ca Ilexagonal coresl cu,v Si Fe, Al Rosette scales Cu, V Si Al, Mg, Ca I Identical results were obtained from three seDarate analvses. Ca is present in trace amounts, X-ray powder photographsof volborthite were taken with 57.3 and 114.59mm. diameter Philips cameras,using nickel-filteredcopper radia- tion. The observed intensities and measured spacings (corrected for shrinkage)are listed in Table II. fhe British Columbia volborthite is associatedwith abundant mala- chite and brochantite, and small amounts of cuprite, tenorite, azurite, calcite,cyanotrichite, connellite, and an unidentified light blue hydrous copper sulphate. Although carnotite was reported from the locality by NOTES AND NEWS 1309 Tasln II. Vor,nonrnrrn; X-Rev Pomnn ParronN d(meas)A d(meas) A d(meas)A I 7.9 264 4 r.79 10 7.t8 6 2.57 A t.7r I /! 2 5.15 \2 2.46 1.68 I I 2 4.43 6 2.39 2 I.J/ I I I 2 4.26 2 2.28 2 1.55 4.10 n 2.23 5 1.51 I I J 2 3.59 2 2.13 1.50 1 3.r0 J 2.04 1.49 /L 4 3.00 \2 1.96 r.47 I 6 2.88 2 1.92 1.46 n 2.72 I .80 T:M t.43 Ellsworth (1932), no additional carnotite or uranium minerals have been found in the area.The maximum reportedvalue of VzOrin the sediment is over 3 per cent, but the lack of sufficientquantities of the copper and vanadium-bearingrock hasresulted in the depositsgenerally being classi- fied as uneconomical. AcrNowrnncMENT The writer is grateful for the supervisionand assistanceof Dr. R. M. Thompson,Professor of Mineralogy, the University of British Columbia. RrlBrurcn Er,r.swontn, H. V. (1932): Rare-element Minerals of Canada; Geol'. Suro., Canada, Economic Geol.Ser. ll, 139. THE AMERICAN MINERALOGIST, VOL. 45, NOVEMBER-DECENIBER, 1960 THE BULK COMPOSITIONOF A ZONED CRYSTAL" ANnnBw Gnrscou, U. S. GeologicalSurvey, Washington, D. C. Quantitative petrographic studies often require an estimate of the bulk compositionof zonedcrystals, such as plagioclasefeldspars. Bowen (1928,p. 143) pointed out in this connectionthat "the outer shell of a crystal requires to have only about one-tenth the thickness of the whole crystal in order to constitute half the volume." X-ray or oil immersion methods of bulk composition determination sufier from similar diffi- * Publication authorized by the Director, U. S. Geological Survey..
Load more

Recommended publications
  • Volborthite Cu3v2o7(OH)2 • 2H2O C 2001-2005 Mineral Data Publishing, Version 1
    Volborthite Cu3V2O7(OH)2 • 2H2O c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Monoclinic, pseudohexagonal. Point Group: 2/m. Typically as rosettelike aggregates of scaly crystals, which may have a hexagonal or triangular outline, to 5 mm. Physical Properties: Cleavage: One, perfect. Hardness = 3.5 D(meas.) = 3.5–3.8 D(calc.) = 3.52 Optical Properties: Semitransparent. Color: Dark olive-green, green, yellowish green; green to yellowish green in transmitted light. Luster: Vitreous, oily, resinous, waxy, pearly on the cleavage. Optical Class: Biaxial (–) or biaxial (+). Pleochroism: Faint. Dispersion: r<v,r>v, inclined. α = 1.820–2.01 β = 1.835–2.05 γ = 1.92–2.07 2V(meas.) = 63◦–83◦ Cell Data: Space Group: C2/m. a = 10.610(2) b = 5.866(1) c = 7.208(1) β =95.04(2)◦ Z=2 X-ray Powder Pattern: Monument No. 1 mine, Arizona, USA. 7.16 (10), 2.643 (7), 2.571 (7), 2.389 (7), 4.103 (5), 3.090 (5), 2.998 (5) Chemistry: (1) (2) (1) (2) V2O5 36.65 38.32 CuO 48.79 50.29 SiO2 1.37 H2O [11.49] 11.39 V2O3 1.70 Total [100.00] 100.00 (1) Scrava mine, Italy; by electron microprobe; V2O3 assumed for charge balance, H2Oby 5+ 3+ • • difference; corresponds to Cu2.89V1.90V0.11Si0.11O7(OH)2 2H2O. (2) Cu3V2O7(OH)2 2H2O. Occurrence: An uncommon secondary mineral in the oxidized zone of vanadium-bearing hydrothermal mineral deposits. Association: Brochantite, malachite, atacamite, tangeite, chrysocolla, barite, gypsum. Distribution: In Russia, originally from an unknown locality; later identified at the Sofronovskii copper mine, near Perm, and at Syssersk and Nizhni Tagil, Ural Mountains.
    [Show full text]
  • Arxiv:2103.13254V2 [Cond-Mat.Str-El] 20 May 2021
    Magnetic ordering of the distorted kagome antiferromagnet Y3Cu9(OH)18[Cl8(OH)] prepared via optimal synthesis W. Sun,1 T. Arh,2, 3 M. Gomilˇsek,2 P. Koˇzelj,2, 3 S. Vrtnik,2 M. Herak,4 J.-X. Mi,1 and A. Zorko2, 3, ∗ 1Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, Fujian Province, People’s Republic of China 2JoˇzefStefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia 3Faculty of Mathematics and Physics, University of Ljubljana, Jadranska u. 19, SI-1000 Ljubljana, Slovenia 4Institute of Physics, Bijeniˇckac. 46, HR-10000 Zagreb, Croatia (Dated: May 21, 2021) Experimental studies of high-purity kagome-lattice antiferromagnets (KAFM) are of great impor- tance in attempting to better understand the predicted enigmatic quantum spin-liquid ground state of the KAFM model. However, realizations of this model can rarely evade magnetic ordering at low temperatures due to various perturbations to its dominant isotropic exchange interactions. Such a situation is for example encountered due to sizable Dzyaloshinskii-Moriya magnetic anisotropy in YCu3(OH)6Cl3, which stands out from other KAFM materials by its perfect crystal structure. We find evidence of magnetic ordering also in the distorted sibling compound Y3Cu9(OH)18[Cl8(OH)], which has recently been proposed to feature a spin-liquid ground state arising from a spatially anisotropic kagome lattice. Our findings are based on a combination of bulk susceptibility, specific heat, and magnetic torque measurements that disclose a N´eeltransition temperature of TN = 11 K in this material, which might feature a coexistence of magnetic order and persistent spin dynamics as previously found in YCu3(OH)6Cl3.
    [Show full text]
  • 3F, a New Apatite-Group Mineral and the Novel Natural Ternary Solid
    2 3 4 Pliniusite, Ca5(VO4)3F, a new apatite-group mineral and the novel natural ternary solid- 5 solution system pliniusite–svabite–fluorapatite 6 7 Igor V. Pekov1*, Natalia N. Koshlyakova1, Natalia V. Zubkova1, Arkadiusz Krzątała2, Dmitry I. 8 Belakovskiy3, Irina O. Galuskina2, Evgeny V. Galuskin2, Sergey N. Britvin4, Evgeny G. 9 Sidorov5†, Yevgeny Vapnik6 and Dmitry Yu. Pushcharovsky1 10 11 1Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia 12 2Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia, Będzińska 60, 13 41-200 Sosnowiec, Poland 14 3Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 15 119071 Moscow, Russia 16 4Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. 17 Petersburg, Russia 18 5Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences, 19 Piip Boulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia 20 6Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, POB 21 653, Beer-Sheva 84105, Israel 22 23 † Deceased 20 March 2021 24 25 *Corresponding author: [email protected] 26 2 28 ABSTRACT 29 The new apatite-group mineral pliniusite, ideally Ca5(VO4)3F, was found in fumarole deposits at the 30 Tolbachik volcano (Kamchatka, Russia) and in a pyrometamorphic rock of the Hatrurim Complex 31 (Israel). Pliniusite, together with fluorapatite and svabite, forms a novel and almost continuous 32 ternary solid-solution system characterized by wide variations of T5+ = P, As and V. In paleo- 33 fumarolic deposits at Mountain 1004 (Tolbachik), members of this system, including the holotype 34 pliniusite, are associated with hematite, tenorite, diopside, andradite, kainotropite, baryte and 35 supergene volborthite, brochantite, gypsum and opal.
    [Show full text]
  • Articles Devoted to Silicate Minerals from Fumaroles of the Tol- Bachik Volcano (Kamchatka, Russia)
    Eur. J. Mineral., 32, 101–119, 2020 https://doi.org/10.5194/ejm-32-101-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia – Part 1: Neso-, cyclo-, ino- and phyllosilicates Nadezhda V. Shchipalkina1, Igor V. Pekov1, Natalia N. Koshlyakova1, Sergey N. Britvin2,3, Natalia V. Zubkova1, Dmitry A. Varlamov4, and Eugeny G. Sidorov5 1Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia 2Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia 3Kola Science Center of Russian Academy of Sciences, Fersman Str. 14, 184200 Apatity, Russia 4Institute of Experimental Mineralogy, Russian Academy of Sciences, Academica Osypyana ul., 4, 142432 Chernogolovka, Russia 5Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences, Piip Boulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia Correspondence: Nadezhda V. Shchipalkina ([email protected]) Received: 19 June 2019 – Accepted: 1 November 2019 – Published: 29 January 2020 Abstract. This is the initial paper in a pair of articles devoted to silicate minerals from fumaroles of the Tol- bachik volcano (Kamchatka, Russia). These papers contain the first systematic data on silicate mineralization of fumarolic genesis. In this article nesosilicates (forsterite, andradite and titanite), cyclosilicate (a Cu,Zn- rich analogue of roedderite), inosilicates (enstatite, clinoenstatite, diopside, aegirine, aegirine-augite, esseneite, “Cu,Mg-pyroxene”, wollastonite, potassic-fluoro-magnesio-arfvedsonite, potassic-fluoro-richterite and litidion- ite) and phyllosilicates (fluorophlogopite, yanzhuminite, “fluoreastonite” and the Sn analogue of dalyite) are characterized with a focus on chemistry, crystal-chemical features and occurrence.
    [Show full text]
  • Identification and Occurrence of Uranium and Vanadium Minerals from the Colorado Plateaus
    SpColl £2' 1 Energy I TEl 334 Identification and Occurrence of Uranium and Vanadium Minerals from the Colorado Plateaus ~ By A. D. Weeks and M. E. Thompson ~ I"\ ~ ~ Trace Elements Investigations Report 334 UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY IN REPLY REFER TO: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY WASHINGTON 25, D. C. AUG 12 1953 Dr. PhilUp L. Merritt, Assistant Director Division of Ra1'r Materials U. S. AtoTILic Energy Commission. P. 0. Box 30, Ansonia Station New· York 23, Nei< York Dear Phil~ Transmitted herewith are six copies oi' TEI-334, "Identification and occurrence oi' uranium and vanadium minerals i'rom the Colorado Plateaus," by A , D. Weeks and M. E. Thompson, April 1953 • We are asking !41'. Hosted to approve our plan to publish this re:por t as a C.i.rcular .. Sincerely yours, Ak~f777.~ W. H. ~radley Chief' Geologist UNCLASSIFIED Geology and Mineralogy This document consists or 69 pages. Series A. UNITED STATES DEPARTMENT OF TEE INTERIOR GEOLOGICAL SURVEY IDENTIFICATION AND OCCURRENCE OF URANIUM AND VANADIUM MINERALS FROM TEE COLORADO PLATEAUS* By A• D. Weeks and M. E. Thompson April 1953 Trace Elements Investigations Report 334 This preliminary report is distributed without editorial and technical review for conformity with ofricial standards and nomenclature. It is not for public inspection or guotation. *This report concerns work done on behalf of the Division of Raw Materials of the u. s. Atomic Energy Commission 2 USGS GEOLOGY AllU MINEFALOGY Distribution (Series A) No. of copies American Cyanamid Company, Winchester 1 Argulllle National La:boratory ., ., .......
    [Show full text]
  • Geology, Geochemistry, and Mineralogy of the Ridenour Mine Breccia Pipe, Arizona
    UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Geology, Geochemistry, and Mineralogy of the Ridenour Mine Breccia Pipe, Arizona by Karen J. Wenrich1 , Earl R. Verbeek 1 , Hoyt B. Sutphin2 , Peter J. Modreski 1 , Bradley S. Van Gosen 11, and David E. Detra Open-File Report 90-0504 This study was funded by the Bureau of Indian Affairs in cooperation with the Hualapai Tribe. 1990 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. U.S. Geological Survey 2U.S. Pollution Control, Inc. Denver, Colorado Boulder, Colorado CONTENTS Page Abstract ................................................................... 1 Introduction ............................................................... 2 Geology and structure of the Ridenour mine ................................. 5 Structural control of the Ridenour and similar pipes ....................... 7 Mine workings ............................................................. 11 Geochemistry .............................................................. 11 Metals strongly enriched at the Ridenour pipe ......................... 23 Vanadium ......................................................... 23 Silver ........................................................... 30 Copper ........................................................... 30 Gallium .......................................................... 30 Isotopic studies ...................................................... 30 Mineralogy ...............................................................
    [Show full text]
  • Vanadiocarpholite, Mn2+V3+Al(Si2o6)(OH)4, A
    Eur. J. Mineral. 2005, 17, 501-507 2+ 3+ Vanadiocarpholite, Mn V Al(Si2O6)(OH)4, a new mineral from the Molinello mine, northern Apennines, Italy RICCARDO BASSO1*, ROBERTO CABELLA1, GABRIELLA LUCCHETTI1, ALBERTO MARTINELLI2 and ANDREA PALENZONA3 1Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova, Corso Europa 26, I-16132 Genova, Italy 2LAMIA-INFM, Corso Perrone 24, I-16152 Genova, Italy 3Dipartimento di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso 31, I-16146 Genova, Italy 2+ 3+ Abstract: Vanadiocarpholite, Mn V Al(Si2O6)(OH)4, occurs at the Molinello mine (Liguria, Italy) in mm-thick veins and in open fissures in a silicified wood sample from Mn-ore bearing cherts. Vanadiocarpholite is found as millimetric aggregates of acicular crystals associated with coatings and crystals of dark-green volborthite and quartz; rarely strongly elongated [001] pris- matic crystals up to 400 µm are also found. The crystals vary in colour from honey yellow-brown and brown (prismatic crystals) to pale straw-yellow (acicular crystal aggregates); they are brittle (prismatic crystals) to flexible (acicular crystals), transparent and non-fluorescent, with vitreous to silky lustre (prismatic crystals and acicular crystal aggregates, respectively) and nearly white streak; they show a perfect {010} cleavage; parting and twinning were not observed. The empirical formula of vanadiocarpholite, 2+ 3+ derived from microprobe analyses and structural refinement, approaches the ideal formula, Mn V Al(Si2O6)(OH)4; however, a wide compositional range is detected, mainly due to a solid solution with carpholite (V3+ vs Al substitution). X-ray single crystal data give the refined cell parameters a = 13.830(2) Å, b = 20.681(3) Å, c = 5.188(1) Å and V = 1483.86 Å3 in the space group Ccca.
    [Show full text]
  • Minerals of Arizona Report
    MINERALS OF ARIZONA by Frederic W. Galbraith and Daniel J. Brennan THE ARIZONA BUREAU OF MINES Price One Dollar Free to Residents of Arizona Bulletin 181 1970 THE UNIVERSITY OF ARIZONA TUCSON TABLE OF CONT'ENTS EIements .___ 1 FOREWORD Sulfides ._______________________ 9 As a service about mineral matters in Arizona, the Arizona Bureau Sulfosalts ._. .___ __ 22 of Mines, University of Arizona, is pleased to reprint the long-standing booklet on MINERALS OF ARIZONA. This basic journal was issued originally in 1941, under the authorship of Dr. Frederic W. Galbraith, as Simple Oxides .. 26 a bulletin of the Arizona Bureau of Mines. It has moved through several editions and, in some later printings, it was authored jointly by Dr. Gal­ Oxides Containing Uranium, Thorium, Zirconium .. .... 34 braith and Dr. Daniel J. Brennan. It now is being released in its Fourth Edition as Bulletin 181, Arizona Bureau of Mines. Hydroxides .. .. 35 The comprehensive coverage of mineral information contained in the bulletin should serve to give notable and continuing benefits to laymen as well as to professional scientists of Arizona. Multiple Oxides 37 J. D. Forrester, Director Arizona Bureau of Mines Multiple Oxides Containing Columbium, February 2, 1970 Tantaum, Titanium .. .. .. 40 Halides .. .. __ ____ _________ __ __ 41 Carbonates, Nitrates, Borates .. .... .. 45 Sulfates, Chromates, Tellurites .. .. .. __ .._.. __ 57 Phosphates, Arsenates, Vanadates, Antimonates .._ 68 First Edition (Bulletin 149) July 1, 1941 Vanadium Oxysalts ...... .......... 76 Second Edition, Revised (Bulletin 153) April, 1947 Third Edition, Revised 1959; Second Printing 1966 Fourth Edition (Bulletin 181) February, 1970 Tungstates, Molybdates.. _. .. .. .. 79 Silicates ...
    [Show full text]
  • 1 Kagomé-Like Lattice in Volborthite Spin-1/2 Kagomé-Like
    Kagomé-Like Lattice in Volborthite Spin-1/2 Kagomé -Like Lattice in Volborthite Cu 3V2O7(OH) 2·2H 2O Zenji HIROI,* Masafumi HANAWA, Naoya KOBAYASHI,1 Minoru NOHARA,2 Hidenori TAKAGI,2 Yoshitomo KATO, and Masashi TAKIGAWA Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan 1Toda Kogyo Corp., Meijishinkai, Otake, Hiroshima 739-0652, Japan 2Graduate School of Frontier Sciences, University of Tokyo, Hongo, Bukyo-ku, Tokyo 113-8656, Japan (Received April 3, 2001) KEYWORDS: kagomé lattice, Cuprate, Magnetic susceptibility, Specific heat, NMR ABSTRACT 2+ A novel cuprate Volborthite, Cu3V2O7(OH)2·2H2O, containing an S-1/2 (Cu spin) kagomé-like lattice is studied by magnetic susceptibility, specific heat, and 51V NMR measurements. Signs for neither long-range order nor spin-gapped singlet ground states are detected down to 1.8 K, in spite of large antiferromagnetic couplings of ~ 100 K between Cu spins forming a two-dimensional kagomé-like network. It is suggested that Volborthite represents a system close to a quantum critical point between classical long-range ordered and quantum disordered phases. *E-mail: [email protected] §1. Introduction singlet-triplet gap is filled with nonmagnetic excitations, the origin of which is possibly related to Geometrical frustration in quantum the ground state degeneracy of the classical model. antiferromagnets (AFMs) tends to stabilize unusual To clarify the essential feature of the kagomé ground states such as a spin glass and a spin liquid AFMs, we need a real-life material on which a quasi- instead of classical Néel order. It occurs on various 2D kagomé lattice is realized.
    [Show full text]
  • New Mineral Names*
    American Mineralogist, Volume 94, pages 399–408, 2009 New Mineral Names* GLENN POIRIER,1 T. SCOTT ERCIT ,1 KIMBERLY T. TAIT ,2 PAULA C. PIILONEN ,1,† AND RALPH ROWE 1 1Mineral Sciences Division, Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada 2Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada ALLORIITE * epidote, magnetite, hematite, chalcopyrite, bornite, and cobaltite. R.K. Rastsvetaeva, A.G. Ivanova, N.V. Chukanov, and I.A. Chloro-potassichastingsite is semi-transparent dark green with a Verin (2007) Crystal structure of alloriite. Dokl. Akad. Nauk, greenish-gray streak and vitreous luster. The mineral is brittle with 415(2), 242–246 (in Russian); Dokl. Earth Sci., 415, 815–819 perfect {110} cleavage and stepped fracture. H = 5, mean VHN20 2 3 (in English). = 839 kg/mm , Dobs = 3.52(1), Dcalc = 3.53 g/cm . Biaxial (–) and strongly pleochroic with α = 1.728(2) (pale orange-yellow), β = Single-crystal X-ray structure refinement of alloriite, a member 1.749(5) (dark blue-green), γ = 1.751(2) (dark green-blue), 2V = of the cancrinite-sodalite group from the Sabatino volcanic complex, 15(5)°, positive sign of elongation, optic-axis dispersion r > v, Latium, Italy, gives a = 12.892(3), c = 21.340(5) Å, space group orientation Y = b, Z ^ c = 11°. Analysis by electron microprobe, wet chemistry (Fe2+:Fe3+) P31c, Raniso = 0.052 [3040 F > 6σ(F), MoKα], empirical formula and the Penfield method (H2O) gave: Na2O 1.07, K2O 3.04, Na18.4K6Ca4.8[(Si6.6Al5.4)4O96][SO4]4.8Cl0.8(CO3)x(H2O)y, crystal- CaO 10.72, MgO 2.91, MnO 0.40, FeO 23.48, Fe2O3 7.80, chemical formula {Si26Al22O96}{(Na3.54Ca0.46) [(H2O)3.54(OH)0.46]} + Al2O3 11.13, SiO2 35.62, TiO2 0.43, F 0.14, Cl 4.68, H2O 0.54, {(Na16.85K6Ca1.15)[(SO4)4(SO3,CO3)2]}{Ca4[(OH)1.6Cl0.4]} (Z = 1).
    [Show full text]
  • Identification and Occurrence of Uranium and Vanadium Minerals from the Colorado Plateaus
    Identification and Occurrence of Uranium and Vanadium Minerals From the Colorado Plateaus GEOLOGICAL SURVEY BULLETIN 1009-B IDENTIFICATION AND OCCURRENCE OF URANIUM AND VANADIUM MINERALS FROM THE COLORADO PLATEAUS By A. D. WEEKS and M. E. THOMPSON ABSTRACT This report, designed to make available to field geologists and others informa­ tion obtained in recent investigations by the Geological Survey on identification and occurrence of uranium minerals of the Colorado Plateaus, contains descrip­ tions of the physical properties, X-ray data, and in some instances results of chem­ ical and spectrographic analysis of 48 uranium and vanadium minerals. Also included is a list of locations of mines from which the minerals have been identified. INTRODUCTION AND ACKNOWLEDGMENTS The 48 uranium and vanadium minerals described in this report are those studied by the writers and their colleagues during recent mineralogic investigation of uranium ores from the Colorado Plateaus. This work is part of a program undertaken by the Geological Survey on behalf of the Division of Raw Materials of the U. S. Atomic Energy Commission. Thanks are due many members of the Geological Survey who have worked on one or more phases of the study, including chemical, spec­ trographic, and X-ray examination,' as well as collecting of samples. The names of these Survey members are given in the text where the contribution of each is noted. The writers are grateful to George Switzer of the U. S. National Museum and to Clifford Frondel of Harvard University who kindly lent type mineral specimens and dis­ cussed various problems. PURPOSE The purpose of this report is to make available to field geologists and others who do not have extensive laboratory facilities, information obtained in recent investigations by the Geological Survey on the identification and occurrence of the uranium and vanadium minerals of ores from the plateaus.
    [Show full text]
  • 687 Martyite, a New Mineral Species Related To
    687 The Canadian Mineralogist Vol. 46, pp. 687-692 (2008) DOl: 1O.3749/canmin.46.3.687 MARTYITE, A NEW MINERAL SPECIES RELATED TO VOLBORTHITE: DESCRIPTION AND CRYSTAL STRUCTURE ANTHONY R. KAMPP§ Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A. IAN M. STEELE Department of the Geophysical Sciences, The University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637, U.S.A. ABSTRACT Martyite, Zn3(V 207)(OHho2H20, a new mineral species from the Blue Cap mine, near La Sal, San Juan County, Utah, U.S.A., is named for its discoverer, Joe Marty, of Salt Lake City, Utah, who is also responsible for the discovery of three other new minerals from the same area. Martyite formed from post-mining leaching and oxidation of V-U oxide replacements of organic matter. It occurs as thin yellow-orange to red-orange plates and flakes with a rounded or irregular outline, up to 0.01 mm thick and 1 mm long, typically in irregularly intergrown mats and rosette-like clusters. The mineral has a pale yellow-orange streak, an adamantine luster, aMohs hardness of about 3, and two cleavages, {001} perfect and {1l0} good. The measured density is 3.37(3) g/cm", and the calculated density is 3.375 g/cm", It is optically uniaxial (+), co 1.797(3), E 1.806(3), and distinctly pleochroic: 0 »E. Electron-microprobe analyses provided: ZnO 46.93, CoO 2.39, CaO 0.58, MgO 0.03, V20S 39.47, H20 12.06 (calc.), total 101.46% which, based on V = 2 apfu and sufficient H for charge balance, yields (Zn266C(l(l1SCaooS)(V207)(OHhno2.23H20.
    [Show full text]