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A New Mineral from Poзos De Caldas, Minas Gerais

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Ñïèñîê ëèòåðàòóðû Ïåêîâ È. Â., Âèíîãðàäîâà Ð. À., ×óêàíîâ Í. Â., Êóëèêîâà È. Ì. Î ìàãíåçèàëüíûõ è êîáàëüòîâûõ àð- ñåíàòàõ ãðóïï ôàéðôèëäèòà è ðîçåëèòà / ÇÂÌÎ. 2001. ¹ 4. Ñ. 10—23. 4+ Burns P. C., Clark C. M., Gault R. A. Juabite, CaCu10(Te O3)4(AsO4)4(OH)2(H2O)4: crystal structure and revision of the chemical formula / Canad. Miner. 2000a. Vol. 38. P. 823—830. Burns P. C., Pluth J. J., Smith J. V., Eng P., Steele I., Housley R. M. Quetzalcoatlite: A new octahed- ral-tetrahedral structure from a 2 % 2 % 40 ìm3 crystal at the Advances Photon Source-GSE-CARS Facility / Amer. Miner. 2000b. Vol. 85. P. 604—607. 4+ 6+ Frost R. L., Keefe E. C. Raman spectroscopic study of kuranakhite PbMn Te O6 — a rare tellurate mi- neral / J. Raman Spectroscopy. 2009. Vol. 40(3). P. 249—252. Grice J. D., Roberts A. C. Frankhawthorneite, a unique HCP framework structure of a cupric tellurate / Canad. Miner. 1995. Vol. 33. P. 823—830. Lam A. E., Groat L. A., Ercit T. S. The crystal structure of dugganite, Pb3Zn3TeAs2O14 / Canad. Miner. 1998. Vol. 36. P. 823—830. Mandarino J. A. The Gladstone—Dale relationship: Part IV. The compatibility concept and its applicati- on / Canad. Miner. 1981. Vol. 19. P. 441—450. Pekov I. V., Jensen M. C., Roberts A. C., Nikischer A. J. A new mineral from an old locality: eurekadum- pite takes seventeen years to characterize / Mineral News. 2010. Vol. 26(2). P. 1—3. Pertlik F. Der Strukturtyp von Emmonsit, {Fe2(TeO3)3$H2O}$xH2O(x = 0—1) / Tschermaks Miner. Petrog. Mitt. 1972. Vol. 18. P. 157—168. Roberts A., Stirling J. A. R., Criddle A. J., Jensen M. C., Moffatt E. A., Wiulson W. E. Utahite, a new mi- neral and associated copper tellurates from the Centennial Eureka mine, Tintic district, Juab County, Utah / Miner. Record. 1997. Vol. 27. P. 175—179. Roberts A. C. An orthorhombic cell for tlalocite / Geol. Surv. Can. 1978. Paper 78—1C. P. 104. Shannon R. D., Prewitt C. T. Effective ionic radii in oxides and fluorides / Acta Cryst. 1969. C25. P. 925—945. Williams S. Quetzalcoatlite, Cu4Zn8(TeO3)3(OH)18, a new mineral from Moctezuma, Sonora / Miner. Mag. 1973. Vol. 39. P. 261—263. Williams S. Xocomecatlite, Cu3TeO4(OH)18, and tlalocite, Cu10Zn6(TeO3)(TeO4)2Cl(OH)25$27H2O, two new minerals from Moctezuma, Sonora, Mexico / Miner. Mag. 1975. Vol. 40./ P. 221—226. Ïîñòóïèëà â ðåäàêöèþ 26 ôåâðàëÿ 2010 ã. ÓÄÊ 549.657+548.6 ÇÐÌÎ, ¹ 4, 2010 ã. Zapiski RMO, N 4, 2010 S. F. NOMURA,* D. ATENCIO,* N. V. CHUKANOV,** R. K. RASTSVETAEVA,*** J. M. V. COUTINHO,* T. K. KARIPIDIS*** MANGANOEUDIALYTE — A NEW MINERAL FROM POÇOS DE CALDAS, MINAS GERAIS, BRAZIL * Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil; e-mail: [email protected] ** Institute of Problems of Chemical Physics, 142432 Chernogolovka, Moscow Oblast, Russia *** Institute of Crystallography, Russian Academy of Sciences, Leninskii Prospeñt 59, Moscow 119333, Russia Manganoeudialyte, ideally Na14Ca6Mn3Zr3[Si26O72(OH)2]Cl2$4H2O, is a new mineral from a khibini- te from the northern edge («Anel Norte») of the alkaline Poços de Caldas massif, Minas Gerais, Brazil. The new mineral species has been approved by the CNMNC (IMA 2009-039). Key words: manganoeudialyte, new mineral, eudialyte-group minerals, crystal structure, Poços de Caldas, Minas Gerais, Brazil. © Ñ. Ô. ÍÎÌÓÐÀ, Ä. ÀÒÅÍÑÈÎ, ä. ÷ë. Í. Â. ×ÓÊÀÍÎÂ, ä. ÷ë. Ð. Ê. ÐÀÑÖÂÅÒÀÅÂÀ, Æ. Ì. Â. ÊÎÓÒÈÍÜÎ, Ò. Ê. ÊÀÐÈÏÈÄÈÑ. ÌÀÍÃÀÍÎÝÂÄÈÀËÈÒ — ÍÎÂÛÉ ÌÈÍÅÐÀË ÈÇ ÌÀÑÑÈÂÀ ÏÎÑÎÑ ÄÅ ÊÀËÜÄÀÑ, ÌÈÍÀÑ ÆÅÐÀÈÑ, ÁÐÀÇÈËÈß Íîâûé ìèíåðàë ìàíãàíîýâäèàëèò Na14Ca6Mn3Zr3[Si26O72(OH)2]Cl2$4H2O îáíàðóæåí â ñîñòàâå õèáèíèòà èç ñåâåðíîé ÷àñòè ùåëî÷íîãî ìàññèâà Ïîñîñ äå Êàëüäàñ (Ìèíàñ Æåðàèñ, Áðàçèëèÿ) â 35 âèäå àãðåãàòîâ (ðàçìåðîì äî 1 ñì) ðîçîâûõ äî ïóðïóðíûõ çåðåí â èíòåðñòèöèÿõ ìåæäó èíäèâèäàìè ãëàâíûõ ìèíåðàëîâ ïîðîäû, â àññîöèàöèè ñ ýâäèàëèòîì, êàëèåâûì ïîëåâûì øïàòîì, íåôåëèíîì, ýãèðèíîì, àíàëüöèìîì, ñîäàëèòîì, ðèíêèòîì, ëàìïðîôèëëèòîì, àñòðîôèëëèòîì, òèòàíèòîì, ôëþî- ðèòîì è êàíêðèíèòîì. Íîâûé ìèíåðàë ïðîçðà÷íûé äî ïðîñâå÷èâàþùåãî, â ÓÔ ëó÷àõ íå ëþìèíåñ- öèðóåò; õðóïêèé, òâåðäîñòü ïî øêàëå Ìîîñà îò 5 äî 6. Èçìåðåííàÿ ïëîòíîñòü — 2.890 ã/ñì3, âû÷èñ- 3 ëåííàÿ — 2.935 ã/ñì . Ìàíãàíîýâäèàëèò îïòè÷åñêè îäíîîñíûé (+), no = 1.603(2), ne = 1.608(2) (äëÿ áåëîãî ñâåòà). Ïëåîõðîèçì íå ïðîÿâëÿåòñÿ. Õèìè÷åñêèé ñîñòàâ (ìèêðîçîíä, âîäà îïðåäåëåíà ìåòî- äîì Ïåíôèëäà, ìàñ. %): Na2O 12.01, K2O 0.59, CaO 10.70, MnO 3.51, SrO 3.00, FeO 2.72, Al2O3 0.41, La2O3 0.15, Ce2O3 0.12, SiO2 48.70, TiO20.47, ZrO2 12.08, Nb2O5 1.21, HfO2 0.25, F 0.08, Cl 0.99, H2O 3.5, -Oß(Cl,F) –0.26; ñóììà 100.23. Ýìïèðè÷åñêàÿ ôîðìóëà, ðàññ÷èòàííàÿ íà Si + Al + Zr + Ti + + Hf + Nb = 29: H12.08Na12.05Sr0.90K0.39La0.03Ce0.02Ca5.93 (Mn1.54Fe1.18)Zr3.03Nb0.28Al0.25Hf0.04Ti0.18$ Si25.20O79.40Cl0.87F0.13. Êðèñòàëëè÷åñêàÿ ñòðóêòóðà èçó÷åíà ìîíîêðèñòàëüíûì ìåòîäîì (R = 0.033). Ìèíåðàë òðèãîíàëüíûé, ïð. ãð. R3m; a = 14.2418(1), c = 30.1143(3) Å, V = 5289.7(1) Å3, Z = 3. Ìàð- ãàíåö çàñåëÿåò èñêàæåííûé îêòàýäð [MnO4(H2O)2]. Êðèñòàëëîõèìè÷åñêàÿ ôîðìóëà ìàíãàíî- VI V V IV VI ýâäèàëèò: [Na11.93Sr0.81(H3O)0.70K0.39Ce0.07]Ó13.90[Ca6][ Mn1.56 Fe1.20 Na0.24]Ó3.00[Zr3][ (Si0.38Al0.25) IV VI (Nb0.29Zr0.08)]Ó1.00[ Si0.81 Ti0.19]Ó1.00[Si24O72][(OH)2]$[(H2O)3.55Cl0.88(OH)0.84O0.40F0.13]Ó5.80. Ñèëüíûå ëèíèè ïîðîøêîâîé ðåíòãåíîãðàììû [d, Å (I,%)(hkl)]: 6.421 (37) (104), 4.329 (30) (205), 3.526 (46) (027), 3.218 (100), 3.023 (25) (042), 1.609 (77) (4.1.15), 1.605 (41) (4.0.16). ÈÊ-ñïåêòð ñîäåðæèò ïîëî- –1 2+O –1 ñû ìîëåêóë âîäû äâóõ òèïîâ (ïðè 1620 è 1677 ñì ) è ïîëèýäðîâ (Fe 5) (ïðò 529 ñì ). Ìèíåðàë óòâåðæäåí ÊÍÌÍÌ ÌÌÀ (IMA No. 2009-039). Êëþ÷åâûå ñëîâà: ìàíãàíîýâäèàëèò, íîâûé ìèíåðàë, ìèíåðàëû ãðóïïû ýâäèàëèòà, êðèñòàëëè÷å- ñêàÿ ñòðóêòóðà, Ïîñîñ äå Êàëüäàñ, Ìèíàñ Æåðàèñ, Áðàçèëèÿ. INTRODUCTION Manganoeudialyte, ideally Na14Ca6Mn3Zr3[Si26O72(OH)2]Cl2·4H2O, has been approved by the CNMNC (IMA 2009-039). The mineral is the Mn-analogue of eudialyte and is named following the nomenclature of eudialyte-group minerals (Johnsen et al., 2003). It may be classified in the Strunz and Nickel (2001) class 9.CO. Type material is deposited in the Mu- seu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo, SP, Brazil (http://www2.igc.usp.br/museu/), specimen number DR704. Eudialyte-group minerals are Na-rich zirconosilicateswith varying amounts of the speci- 2+ 2+ 3+ 2+ 3+ 2+ + 4+ 5+ 6+ + es-determining cations Ca ,Fe ,Fe ,Mn , REE ,Sr ,K ,Ti ,Nb ,W and H3O ,wa- – – – 2– 2– ter molecules, and additional anions Cl ,F,OH, CO3 , SO4 . Their general formula (John- $ sen et al., 2003) can be written as N(1)3N(2)3N(3)3N(4)3N(5)3M(1)6M(2)3—6M(3)M(4) d Å d Å d Å Z3[Si24O72]O’4—6X2. They are trigonal, a 14 , c 30 (rarely 60 ), crystallizing in R3m, R3m or R3. Eudialyte-group minerals belong to the large family of alkaline silicates with heteropolyhedral frameworks. A framework consisting of SiO4 tetrahedra and MO6 oc- tahedra (where M is usually Ti, Nb, or Zr) is a specific structure feature of these minerals (Chukanov and Pekov, 2005). Lately, the number of minerals in this group has increased rapidly and is now 25 (inclu- ding manganoeudialyte). Most of them are reported in Rastsvetaeva (2007). Eudialyte s.l. was reported in the rocks of the Poços de Caldas alkaline massif, Minas Gerais, Brazil, by Guimarães (1948) and Ulbrich and Ulbrich (1992). Microprobe analyses were obtained by Gualda and Vlach (1996) and Johnsen and Gault (1997). On the basis of optical data, Gualda and Vlach (1996) classified one specimen as «eudialyte» (uniaxial positive), another one as «mesodialyte» (optically isotropic), and two specimens as «eucolite» (uniaxial negative). Johnsen et al. (1997) showed that the terms «mesodialyte» and «eucolite» are meaningless. Following the sequence of steps defined by Johnsen and Grice (1999), the eudialyte group minerals from Poços de Caldas are classified as eudialyte (sensu stricto) [either the «eudialy- te» or the «mesodialyte» of Gualda and Vlach (1996), and the Poços de Caldas specimen studied by Johnsen and Gault (1997)], kentbrooksite [one «eucolite» studied by Gualda and Vlach (1996)], and ferrokentbrooksite [the other «eucolite» of Gualda and Vlach (1996)] (Atencio et al., 2000). 36 OCCURRENCE The new eudialyte-group mineral manganoeudialyte occurs in a khibinite, at the nor- thern edge («Anel Norte») of the Upper Cretaceous alkaline Pocos de Caldas massif, a circu- lar intrusion of almost 800 km2, Minas Gerais, Brazil. Emplaced in Precambrian basement rocks and Jurassic sandstones, the intrusion consists of tinguaite, phonolite, nepheline syeni- te, phonolitic lavas, volcanoclastics, lujavrite and khibinite. Hydrothermal alteration and ore deposition have occurred in all rock types, with emphasis on the inner tinguaite and nepheli- ne syenite. Two small lujavrite-khibinite bodies, an eastern and a western one, are exposed at the northern edge of the alkaline Poços de Caldas massif, southeastern Brazil. Detailed mapping reveals at the center of the better exposed western body a coarse-grained, mesocratic, gneis- sic-looking eudialyte-nepheline syenite (lujavrite) with a strong subhorizontal foliation, showing at the contacts a finer-grained border facies. Two trachytoid nepheline syenite ty- pes occur as an envelope to the central lujavrites, followed by an outer shell of coarse-grain- ed eudialyte-nepheline syenite. The internal structure of both bodies is that of a saucer, with successive foliated shells (in part absent in the eastern body), with rather steep dips at the contacts between the different fades; all are surrounded by the outer nepheline syenite.
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  • Minerals of the Eudialyte Group from the Sagasen Larvikite Quarry, Porsgrunn, Norway

    Minerals of the Eudialyte Group from the Sagasen Larvikite Quarry, Porsgrunn, Norway

    = Minerals of the eudialyte group from the Sagasen larvikite quarry, Porsgrunn, Norway Alf Olav Larsen, Arne Asheim and Robert A. Gault Introduction Eudialyte, aNa-rich zirconosilicate with varying amounts of Ca, Fe, Mn, REE, Nb, K, Y, Ti, CI and F, was first described from the llimaussaq alkaline complex, South Greenland by Stromeyer (1819), Since then, the mineral has been described from many other alkaline deposits, and is a characteristic mineral in agpaitic nepheline syenites and their associated pegmatites. In recent years, eudialyte (sensa lata) has been the subject of extensive studies. The broad compositional variations and new insight into the crystal chemistry of the mineral group resulted in the definition of several new species by the Eudialyte Nomenclature Subcommittee under the Commission on New Minerals and Mineral Names of the International Mineralogical Association (Johnsen et al. 2003b). Brown eudialyte (s. I.) is a common constituent of the agpaitic pegmatites in the Langesundsfjord district in the western part of the Larvik plutonic complex (Br0gger 1890). Recent chemical analyses of the mineral have shown that some localities contain ferrokentbrooksite (Johnsen et al. 2003a). Other localities hold eudialyte (sensa stricto). Ferrokentbrooksite is the ferrous-iron-dominant analogue of kentbrooksite with Fe as the predominant element replacing Mn. Kentbrooksite is the Mn-REE-Nb-F end member in a solid solution series between eudialyte (s. s.) and ferrokentbrooksite, with an extension to oneillite (Johnsen et al. 1998, Johnsen et al. 1999, Johnsen et al. 2003a), as well as to carbokentbrooksite and zirsilite-(Ce) (Khomyakov et al. 2003). Carbokentbrooksite has a significant content of carbonate and Na > REE for the N4 site, while zirsilite-(Ce) has REE > Na (with Ce predominant) for the N4 site.
  • JOURNAL the Russell Society

    JOURNAL the Russell Society

    JOURNAL OF The Russell Society Volume 20, 2017 www.russellsoc.org JOURNAL OF THE RUSSELL SOCIETY The journal of British Isles topographical mineralogy EDITOR Dr Malcolm Southwood 7 Campbell Court, Warrandyte, Victoria 3113, Australia. ([email protected]) JOURNAL MANAGER Frank Ince 78 Leconfield Road, Loughborough, Leicestershire, LE11 3SQ. EDITORIAL BOARD R.E. Bevins, Cardiff, U.K. M.T. Price, OUMNH, Oxford, U.K. R.S.W. Braithwaite, Manchester, U.K. M.S. Rumsey, NHM, London, U.K. A. Dyer, Hoddlesden, Darwen, U.K. R.E. Starkey, Bromsgrove, U.K. N.J. Elton, St Austell, U.K. P.A. Williams, Kingswood, Australia. I.R. Plimer, Kensington Gardens, S. Australia. Aims and Scope: The Journal publishes refereed articles by both amateur and professional mineralogists dealing with all aspects of mineralogy relating to the British Isles. Contributions are welcome from both members and non-members of the Russell Society. Notes for contributors can be found at the back of this issue, on the Society website (www.russellsoc.org) or obtained from the Editor or Journal Manager. Subscription rates: The Journal is free to members of the Russell Society. The non-member subscription rates for this volume are: UK £13 (including P&P) and Overseas £15 (including P&P). Enquiries should be made to the Journal Manager at the above address. Back numbers of the Journal may also be ordered through the Journal Manager. The Russell Society: named after the eminent amateur mineralogist Sir Arthur Russell (1878–1964), is a society of amateur and professional mineralogists which encourages the study, recording and conservation of mineralogical sites and material.
  • A Review of the Structural Architecture of Tellurium Oxycompounds

    A Review of the Structural Architecture of Tellurium Oxycompounds

    Mineralogical Magazine, May 2016, Vol. 80(3), pp. 415–545 REVIEW OPEN ACCESS A review of the structural architecture of tellurium oxycompounds 1 2,* 3 A. G. CHRISTY ,S.J.MILLS AND A. R. KAMPF 1 Research School of Earth Sciences and Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia 2 Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia 3 Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA [Received 24 November 2015; Accepted 23 February 2016; Associate Editor: Mark Welch] ABSTRACT Relative to its extremely low abundance in the Earth’s crust, tellurium is the most mineralogically diverse chemical element, with over 160 mineral species known that contain essential Te, many of them with unique crystal structures. We review the crystal structures of 703 tellurium oxysalts for which good refinements exist, including 55 that are known to occur as minerals. The dataset is restricted to compounds where oxygen is the only ligand that is strongly bound to Te, but most of the Periodic Table is represented in the compounds that are reviewed. The dataset contains 375 structures that contain only Te4+ cations and 302 with only Te6+, with 26 of the compounds containing Te in both valence states. Te6+ was almost exclusively in rather regular octahedral coordination by oxygen ligands, with only two instances each of 4- and 5-coordination. Conversely, the lone-pair cation Te4+ displayed irregular coordination, with a broad range of coordination numbers and bond distances.
  • JOHNSENITE-(Ce): a NEW MEMBER of the EUDIALYTE GROUP from MONT SAINT-HILAIRE, QUEBEC, CANADA

    JOHNSENITE-(Ce): a NEW MEMBER of the EUDIALYTE GROUP from MONT SAINT-HILAIRE, QUEBEC, CANADA

    105 The Canadian Mineralogist Vol. 44, pp. 105-115 (2006) JOHNSENITE-(Ce): A NEW MEMBER OF THE EUDIALYTE GROUP FROM MONT SAINT-HILAIRE, QUEBEC, CANADA JOEL D. GRICE§ AND ROBERT A. GAULT Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada ABSTRACT Johnsenite-(Ce), ideally Na12(Ce,La,Sr,Ca,M)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2, is a new member of the eudialyte group from Mont Saint-Hilaire, Quebec, and is the W analogue of zirsilite-(Ce). It occurs as deeply etched, skeletal crystals to 4 mm and aggregates of crystals to 1 cm. Associated minerals include, albite, calcite, pectolite, aegirine, fluorapophyllite, zirsilite-(Ce), a burbankite- group phase, dawsonite, rhodochrosite, epididymite, galena, molybdenite, pyrite, pyrrhotite, quartz, an amphibole-group mineral, sphalerite, stillwellite-(Ce), titanite, cerite-(Ce), tuperssuatsiaite, steacyite, catapleiite, zakharovite, natrolite and microcline. It is transparent to translucent with a vitreous luster and white streak. It is brittle with a Mohs hardness of 5–6. It has no discernable cleavage or parting and an uneven fracture. It is uniaxial negative with v 1.648(1) and 1.637(1). It is trigonal, space group R3m, a 14.237(3) and c 30.03(1) Å, V 5271(2) Å3, Z = 3. The eight strongest X-ray powder-diffrac- tion lines, measured for johnsenite-(Ce) [d in Å (I)(hkl)] are: 11.308(95)(101), 9.460(81)(012), 4.295(34)(205), 3.547(36)(220), 3.395(38)(131), 3.167(75)(217), 2.968(100)(315) and 2.849(81)(404).
  • On the Occasion of His 80Th Anniversary)

    On the Occasion of His 80Th Anniversary)

    Crystallography Reports, Vol. 46, No. 4, 2001, pp. 521–522. Translated from Kristallografiya, Vol. 46, No. 4, 2001, pp. 583–584. Original Russian Text Copyright © 2001 by the Editorial Board. In Memory of Boris Konstantinovich Vainshtein (on the Occasion of His 80th Anniversary) On July 10, 2001, Boris Konstantinovich Vainsh- In 1945, Vainshtein entered the postgraduate course tein, an outstanding physicist–crystallographer and of the Institute of Crystallography and was bound for- member of the Russian Academy of Sciences, would ever with this institute. In 1950, he defended his Candi- have celebrated his eightieth birthday. date and, in 1955, Doctoral dissertations in physics and mathematics. In 1959, he organized and headed the Academician Vainshtein, an outstanding scientist Laboratory of Protein Structure. In 1962, Vainshtein and a remarkable person, has made a great contribution was elected a Corresponding Member and, in 1976, a to the creation and development of modern crystallog- Full Member of the USSR Academy of Sciences. raphy. He was a talented organizer of science and the Being appointed the director of the Institute of Crys- director of the Shubnikov Institute of Crystallography tallography in 1962, Vainshtein continued the scientific for more than 34 years. traditions laid by A.V. Shubnikov and developed crys- Boris Konstantinovich Vainshtein was born in Mos- tallography as a science combining studies along three cow in 1921. He graduated with distinction from two main integral parts—crystal growth, crystal structure, higher schools—the Physics Faculty of Moscow State and crystal properties. The great organizational talent University (1945) and the Metallurgy Faculty of the characteristic of Vainshtein flourished during his direc- Moscow Institute of Steel and Alloys (1947) and torship—he managed to gather around him people received a diploma as a physicist and an engineer- devoted to science and transformed the Institute of researcher.
  • Cesbronite, a New Copper Tellurite from Moctezuma, Sonora

    Cesbronite, a New Copper Tellurite from Moctezuma, Sonora

    MINERALOGICAL MAGAZINE, SEPTEMBER 1974, VOL. 39, PP. 744-6 Cesbronite, a new copper tellurite from Moctezuma, Sonora SIDNEY A. WILLIAMS Phelps Dodge Corporation, Douglas, Arizona SUMMARY. Cesbronite occurs at the Bambollita mine, near Moctezuma, Sonora, with a variety of other tellurites. The colour is 'green beetle' (R.H.S. 135-B) with a pale streak. H 3; Dmeas 4"45:1:0'2. Crystals are orthorhombic 2 mmm with a 8'624 A, b I I '878, C5'872 (all :I:0'016 A); space group Pbcn. For Z = 2 the calculated density is 4'455 gfcm3. The strongest powder lines are 5'934 (100),3'490 (92), 4'889 (71), 2'358 (70), 2'379 (38),1'592 (34), 2'156 (28), and 1.698 (27). Electron-probe analysis gave: CuO 50'3 %, 50'3, 49'8, 49'4; TeO. 39'3 %. 39'2, 38,6, 38,6. Water determined gravimetrically II'O"la. This gives CU5(Te03).(OH)6.2H.O. Cesbronite is pleochroic with absorption y ~ f3 ?> a:. Optically positive with 2Vy calc. 72°; a: 1.880 11[100],f3 1'928 I![OOI],y 2'02911[010]. CESBRONITE was first collected by Peter Embrey and Pierre Bariand during a visit we made to the Bambollita (La Oriental) mine near Moctezuma, Sonora. The mineral is named in honour of Dr. Fabien Cesbron, French mineralogist. There are two thin veins exposed in this mine, and cesbronite occurs in only one. This vein is closer to the portal and is more severely oxidized than the other vein (where quetzalcoatlite occurs).