DOCSLIB.ORG

The Nickel Telluride Mineral Melonite from the Jaduguda Uranium Deposit, Singhbhum Shear Zone, Bihar, India

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Nickel Telluride Mineral Melonite from the Jaduguda Uranium Deposit, Singhbhum Shear Zone, Bihar, India MINERALOGICAL MAGAZINE, JUNE r980, VOL. 43, PP. 775-7 The nickel telluride mineral melonite from the Jaduguda uranium deposit, Singhbhum Shear Zone, Bihar, India N. KRISHNA RAO, D. NARASIMHAN, AND G. V. U. RAO Ore Dressing Section, Bhabha Atomic Research Centre, Chandralok, I i x, Sarojini Devi Road, Hyderabad 5oo oo3, (A.P.), India SUMMARY. The rare nickel telluride mineral melonite Occurrence. The mineral which was later identi- is identified from Jaduguda uranium ore, Singhbhum fied as melonite has been observed in a few samples Shear Zone, Bihar, India. Its physical, optical, chemical, of an apatite-magnetite vein from the o-metre level and paragenetic characteristics are described. The com- as well as in a millerite-rich sample from 165-metre position as obtained by EPMA is NiTel.66Bi0.06 or level in the Jaduguda uranium mine. In the former approximately Ni3(Te,Bi)5. The association of melonite with molybenite in this ore deposit is unusual, since it is closely associated with molybdenite and occurs melonite is generally associated with tellurides of gold and as fracture fillings in the form of coarse xenomor- silver. This is the first reported occurrence of melonite phic grains and flakes in a matrix of apatite, mag- from India. netite, chlorite, and quartz (figs. I and 2). Veinlets traversing cracks and cleavages in molybdenite are DURING the course of an intensive mineralogi- also common (fig. 2). In the I65-metre level sample cal study of uranium prospects from parts of Singh- it occurs as skeletal particles in chalcopyrite bhum Shear Zone, Bihar (Rao, i977) , the rare associated with molybdenite, gersdorffite, and nickel telluride mineral melonite was identified in millerite. a few samples from the Jaduguda uranium mine. Physical and optical properties. The mineral has Though several telluride minerals have been re- perfect (ooo~) cleavage, is very soft, and takes a ported from different parts of the Singhbhum Shear scratch-free polish with difficulty. The Vickers Zone, melonite has not previously been reported. microindentation hardness varies between 67 and This occurrence is also new to India. 76 kg/mm 2 with an average of 73 kg/mm2. FIGS. I and 2. FIG. I (left). Xenomorphic grain of melonite (me) showing (000I) cleavage. Flaky chlorite (ch) euhedral quartz (q) are the other associated minerals. Secondary electron image taken in ETEC SEM. FIG. 2 (right). Association of melonite (me) with flaky molybdenite (mo) and granular magnetite (mt) are the other associated minerals. Veinlets of melonite occupy cleavage in molybdenite. (~) Copyright the Mineralogical Society 776 N. KRISHNA RAO ET AL. The colour in polished sections is creamy white, the reported analyses also correspond to the NiTe2 tarnishing to brown on long exposure. It shows composition (Vlasov, t966, p. 691; Strand, i975; faint bireflectance. The reflectivity is high, slightly Ebner, I978). greater than that of pyrite. The spectral reflectivity The composition of Jaduguda melonite is values measured with a photoelectric device Ni3Te5 ignoring Bi. Thus it is a member of the developed in the Ore Dressing Section, BARC, are NiTe-NiTe2 solid solution series, and the composi- illustrated in fig. 3. The reflectivity spectrum is tion falls at the point NiTez = 80 ~ in the NiTe- characterized by a sharp increase in reflectivity with NiTe2 join. The presence of bismuth reflects the wavelength between 5oo-6oo rim. common occurrence of several bismuth teUuride minerals in other parts of the Singhbhum Shear 70 Zone. Melonite from Jaduguda shows more intense anisotropism and vivid polarization colours com- pared with melonites from elsewhere (Uyten- bogaardt and Burke, I97 t, p. 252 ). The relatively 60 higher content of nickel may explain these non- typical optical properties. Paragenesis. Melonite commonly occurs in (i) gold and silver ores of vein associations, (ii) meta- somatic aureoles associated with other tellurides and (iii) high-temp, copper-nickel deposits of non- 50 volcanic origin (Ramdohr, i969, p. 419; Ebner, I978). Chalcopyrite is a common associate of all I I I I I I known occurrences of melonite whereas pyrite is 450 500 550 600 650 700 generally conspicuous by its absence. The occur- WAVE LENGTH nm rence in Jaduguda is unique in that it is not asso- FIG. 3, Spectral reflectivity curve of melonite. ciated with any gold and silver tellurides, but with molybdenite. Several telluride minerals have been reported Under crossed polars it shows vivid polarization from copper deposits of parts of Singhbhum Shear colours dominated by a violet tinge, which is dearly Zone; these are wehrlite, tetradymite (Sarkar and seen with nearly crossed polars. Larger grains show Deb, i969), volynskite (Narasimhan and Rao, spindle-shaped twin lamellae, perhaps resulting 1976), and suspected krennerite and calaverite (Rao from deformation during polishing. No internal et al., i967). In all these occurrences molybdenite reflections are observed. is also a common associate of telluride minerals. Identification. The physical and optical proper- Further, melonite has been observed only in the ties resemble those of the nickel telluride mineral Jaduguda area where no other telluride mineral has melonite (Vlasov, I966, p. 691 ; Uytenbogaardt and so far been reported. This is perhaps related to the Burke, 197i , p. 252; Ramdohr, ~969, p. 42o). The fact that nickel mineralization is more intense in the identification is confirmed by the wavelength dis- Jaduguda area than in other parts of the Singh- persive X-ray fluorescence spectrum of one grain bhum Shear Zone. taken in a ETEC Scanning Electron Microscope, which showed that nickel and tellurium are the Acknowledgements. The authors are grateful to Dr V. K. essential constituents of this mineral. Moorthy, Head, Metallurgy Group, for his sustained Chemical composition. The composition of the interest in these investigations and to Professor N. K. Jaduguda melonite obtained in a Geoscan EPMA, Mukerjee, Banaras Hindu University for his critical com- after corrections for atomic number, absorption ments. Thanks are also due to Shri S. K. Khera for help and fluorescence factors is Te 75.o2 ~, Ni 2o.78, in EPMA and to Dr R. Krishnan for help in SEM study. Bi 4.zo. It recalculates to NiTel.66Bi0.o6 or ap- proximately Ni3(Te, Bi)s. REFERENCES According to Ramdohr (i 969, P. 419) melonite is a member of the NiTe-NiTe2 solid solution series Ebner (F. S.), I978. Econ. Geol. 73, 447-9. and is often close to NiTe. At 45o ~ a continuous Narasimhan (D.) and Rao (G. V. U.), I976. Indian Geo- logical Congress, First Session, 5 (Abstracts). solid solution series is known to exist between Peacock (M. A.) and Thompson (R. M.), I946. Univ. NiTe2 join. The presence of bismuth reflects the Toronto Studies, Geol. Set. no. 5o, 63-73. studies by Peacock and Thompson (I946) have Ramdohr (P.), 1969. Ore minerals and their intergrowths shown the composition ofmelonite to be NiTe2 and (Pergamon Press), 1I74 pp. MELONITE FROM BIHAR, INDIA 777 Rao (N. K.), i977. Unpublished Ph.D. Thesis, Banaras microscopic identification of ore minerals (Elsevier Hindu University. Publishing Co.), 43 ~ pp. -- Rambabu (Ch.), and Rao (G. V. U.), I967. B.A.R.C. Vlasov (K. A.) (Ed.), 1966. Geochemistry and mineralogy Internal Report Met./Io, pp. 3t-9 . of rare elements and genetic types of their deposits. Sarkar (S. C.) and Deb (M.), I969. Mineral. Mag. 37, Vol. II. (Israel Programme for Scientific Translation, 423-5 . Jerusalem.) 945 PP- Strand (G. S.), I975. Norsk Geol. Tidsskr. 55, 299-3o 3. Uytenbogaardt (W.) and Burke (E. A. J.), 197 I. Tables for [Manuscript received 3I April I979] .
Load more

Recommended publications
  • Download the Scanned
    THn AUERICAN MtxERALocIST JOURNAL OF THE MINERALOGICAL SOCIETY OF AMERICA Vol. 50 MAY-JUNE, 1965 Nos. 5 and 6 KITKAITE (NiTeSe), A NEW MINERAL FROM KUUSAMO, NORTHEAST FINLAND T. A. HArr-r, Y. Vuonor.ArNEN'Outohumpu Company, Outokumpu, Finland' AND Tn.G. Seuaue, Inst'itute oJ Geology,Helsinhi, Finland'. ABSTRACT Kitkaite, NiTese, occurs in carbonate-bearing veinlets in Kuusamo, NE Finland associ- ated with nickel and selenium mineralization. Kitkaite is trigonal, o:3.716+0.005 and c:5.126+0.005 A, space group PEml, Z:1, calculated density 7.19 gm/cc, measured d,ensity 7.22 gm/cc. The mineral is isostructural with melonite with which it forms a solid solution series. Kitkaite is named in allusion to the river Kitka in the valley of which the mineral was found. During prospecting work in 1961 in the valley of the Kitka river in Kuusamo, northeast Finland, a silver-white opaque mineral was en- countered by a field group of the Outokumpu Company. The mineral could not be identified in the field. Therefore, and becauseof its interest- ing mode of occurrencein a zone of nickel and selenium mineralization, it was subjected to a closer study at the researchlaboratory of the Com- pany. It was found that the mineral represents a new specieswith the chemical formula NiTeSe. In allusion to the locality of its discovery, the name kitkaite is suggestedfor the mineral. As has been pointed out by Sindeeva (1964), minerals containing both selenium and tellurium as major elements have been unknown so far. Some selenium-bearingminerals have been reported with low tellurium contents, but the amount of the latter compared with that of selenium is so small that tellurium must be regarded merely as a minor element not essential to the mineral' Thus, e'g.
    [Show full text]
  • Petzite Ag3aute2 C 2001-2005 Mineral Data Publishing, Version 1
    Petzite Ag3AuTe2 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Cubic. Point Group: 432. Massive, fine granular to compact and as irregular shaped blebs, to 2 mm. Physical Properties: Cleavage: {001}. Fracture: Subconchoidal. Tenacity: Slightly sectile to brittle. Hardness = 2.5–3 VHN = 48 (10 g load). D(meas.) = 8.7–9.4 D(calc.) = 8.74 Optical Properties: Opaque. Color: Bright steel-gray to iron-gray to iron-black, commonly tarnished from bronze-yellow to sooty black; in reflected light, grayish white with a pale bluish tint. Luster: Metallic. Anisotropism: Noticeable in part. R: (400) 45.0, (420) 43.7, (440) 42.4, (460) 41.4, (480) 40.6, (500) 39.9, (520) 39.3, (540) 38.8, (560) 38.5, (580) 38.3, (600) 38.2, (620) 38.1, (640) 38.0, (660) 37.8, (680) 37.8, (700) 37.8 Cell Data: Space Group: I4132. a = 10.385(4) Z = 8 X-ray Powder Pattern: Bot´es,Romania. 2.77 (100), 2.12 (80), 2.03 (70), 2.44 (60), 2.32 (60), 7.31 (50), 1.893 (50) Chemistry: (1) (2) (3) Ag 41.37 41.87 41.71 Au 23.42 25.16 25.39 Te 33.00 33.21 32.90 Hg 2.26 Cu 0.16 Total 100.21 100.24 100.00 (1) Kalgoorlie, Australia. (2) Mother Lode district, California, USA. (3) Ag3AuTe2. Occurrence: With other tellurides in vein-controlled gold deposits. Association: Gold, hessite, sylvanite, krennerite, calaverite, altaite, montbrayite, melonite, frohbergite, tetradymite, rickardite, vulcanite, pyrite. Distribution: Noted in small amounts at a number of localities other than those listed here.
    [Show full text]
  • PROCEEDINGS of the TWENTY-SIXTH ANNUAL MEETING of the MINERALOGICAL SOCIETY of AMERICA at PITTSBURGH, PENNSYLVANIA C. S. Hunrnut
    PROCEEDINGSOF THE TWENTY-SIXTH ANNUAL MEETING OF THE MINERALOGICAL SOCIETY OF AMERICA AT PITTSBURGH, PENNSYLVANIA C. S. Hunrnut, Jn., SecretarY The twenty-sixth annual meeting of the Society was held at the Hotel William Penn, Pittsburgh, Pennsylvania, on December 27-29, 1945. The registration figures show that 74 fellows and 56 members attended. Four scientific sessionswere held, two in the afternoon of December 27th and two in the afternoon of December 28th. Because of lack of time the routine business of the Society was not presented at a general session. The luncheon of the Mineralogical Society, which was held on December 27th, was attended by 108 fellows, members and guests. After the luncheon the Society was addressed by Past Presidents R' C. Emmons on "The Shift in Emphasis" and A. F. Buddington on "Some Mineralogical Re- flections.t' The report of the election of officers and fellows lot 1946 and the reports of the officers for the year 1945 are given on the following pages. ELECTION OF OFFICERS AND FELLOWS FOR 1946 The secretary reports that 343 ballots were cast for the officers of the Society as nomi- nated by the Council. The offrcers for 1946 are: Presid.ent: PauI F. Kerr, Columbia University, New York City. Vice-Presiilent: S. B. Hendricks, Bureau of Plant Industry, U' S. Department of Agri- culture, Beltsville, Maryland. Suretary: C. S. Hurlbut, Jr., Harvard University, Cambridge, Mass. Treaswer: Earl Ingerson, Geophysical Laboratory, Washington, D' C. Eilitor: Walter F. Hunt, University ol Michigan, Ann Arbor, Michigan. Councilor (1946-a\: Joseph Murdoch, University of California at Los Angeles, Los Angeles, California.
    [Show full text]
  • Frederick Augustus Genth. 1820-1898
    MEMOIR FREDERICK AUGUSTUS GENTH. 1820-1898. GEORGE F. BARKER. READ BEFORE THE NATIONAL ACADKMV, No vEM unit 12, 1901. (30) 201 BIOGRAPHICAL MEMOIR OF FREDERICK AUGUSTUS GENTH. The pure sciences are sometimes classified as independent and dependent sciences—i. e., as resting upon data solely their own or upon data borrowed from other sciences. Mathematics, physics, and chemistry may be adduced as instances of the former class of sciences; astronomy, mineralogy, and biology as instances of the latter class. Without the fundamental prin- ciples of mathematics and physics, for example, neither mathe- matical nor physical astronomy is possible. Moreover, the properties of minerals are classified either by their chemical composition, by their crystalline form, or by their optical prop- erties ; so that mineralogy as a science is dependent mainly upon physics and chemistry, and to some extent also upon mathe- matics ; so botany and zoology, except in so far as they are clas- sificatorv, are based upon the chemical and physical character- istics of the organisms they investigate and the forms they classify. Our eminent associate who is the subject of the pres- ent memoir took a high rank as an investigator in each of these divisions. His researches in chemistry are equaled in impor- tance only by those which he made in mineralogy. Both were of the highest order, and secured for him a very prominent po- sition among men of science. FRIEDRICH AUGUST LUDWIG KARL WILHELM GENTH was born in the village of Waechtersbach, in Hesse, on the 17th of May, 1820. On his father's side his family was an old Hesse-Nassau family, living for the most part in the neighborhood of Wies- baden.
    [Show full text]
  • Tellurium and Selenium Mineralogy of Gold Deposits in Northern Fennoscandia
    minerals Article Tellurium and Selenium Mineralogy of Gold Deposits in Northern Fennoscandia Arkadii A. Kalinin Kola Science Center, Geological Institute, Russian Academy of Science, 184200 Apatity, Russia; [email protected]; Tel.: +7-921-663-68-36 Abstract: Mineralization of Te and Se was found in gold deposits and uranium occurrences, located in the Paleoproterozoic greenstone belts in Northern Fennoscandia. These deposits are of different genesis, but all of them formed at the late stages of the Svecofennian orogeny, and they have common geochemical association of metals Au, Cu, Co, U, Bi, Te, and Se. The prevalent Te minerals are Ni and Fe tellurides melonite and frohbergite, and Pb telluride altaite. Bismuth tellurides were detected in many deposits in the region, but usually not more than in two–three grains. The main selenide in the studied deposits is clausthalite. The most diversified selenium mineralization (clausthalite, klockmannite, kawazulite, skippenite, poubaite) was discovered in the deposits, located in the Russian part of the Salla-Kuolajarvi belt. Consecutive change of sulfides by tellurides, then by selenotellurides and later by selenides, indicates increase of selenium fugacity, f Se2, in relation to f Te2 and to f S2in the mineralizing fluids. Gold-, selenium-, and tellutium-rich fluids are potentially linked with the post-Svecofennian thermal event and intrusion of post-orogenic granites (1.79–1.75 Ga) in the Salla-Kuolajarvi and Perapohja belts. Study of fluid inclusions in quartz from the deposits in the Salla-Kuolajarvi belt showed that the fluids were high-temperature (240–300 ◦C) with high salinity (up to 26% NaCl-eq.).
    [Show full text]
  • Geological Survey
    DEPARTMENT OF THE INTEKIOE BULLETIN UNITED STATES r'. GEOLOGICAL SURVEY No. 167 ;/ ' WASHINGTON GOVERNMENT PRINTING OFFICE UNITED STATES GEOLOGICAL STJRYEY CHARLES D. WALCOTT, DIRECTOR t ' ' CONTRIBUTIONS TO CHEMISTRY AND MINERALOGY FROM THE FRANK W. OLARKE CHIEF CHEMIST WASHINGTON GOVERNMENT PRINTING OFFICE 1900 CONTENTS. Page. Letter of transmittal........................................................ 9 ' Prefatory note .............................................................. 11 Experiments relative to the constitution of pectolite, pyrophyllite, calamiue, and analcite, by F. W. Clarke and George Steiger ......................... 13 The constitution of tourmaline, by F. W. Clarke ............................ 26 The colorimetric estimation of small amounts of chromium, with special reference to the analysis of rocks and ores, by W. F. Hillebrand ........... 37 Volumetric estimation of vanadium in presence of small amounts of chromium, with special reference to the analysis.of rocks and ores, by W. F. Hille­ brand ........................................................ '. ........... 44 Distribution.and quantitative occurrence of vanadium and molybdenum in rocks of the United States, by W. F. Hillebrand....................... .... 49 Warning against the use of fluoriferous hydrogen peroxide in estimating ^ titanium, by W. F. Hillebrand ........................ .... ................ 56 '! Mineralogical notes, by W. F. Hillebrand ................................... 57 1. Calaverite from Cripple Creek, Colorado ...........................
    [Show full text]
  • Firearm Applications
    Ultimate Surface Performance FIREARM APPLICATIONS INNOVATIVE SURFACE TREATMENTS & COATINGS • Liquid / Salt Bath Nitriding • PVD Coatings • DLC Coatings • Phosphating • REM Superfinishing • Electroless Nickel Plating Full Line of Advanced Surface Treatments HEF Group, through its several US & Canada locations, offers the Firearms industry a com- plete range of advanced surface treatments and coatings to enhance performance and dura- bility. With our wide selection of advanced surface finishes, firearms manufacturers can select the surface treatment that best meets the performance needs and requirements of their specific firearm. Using HEF’s diverse treatments and coatings can significantly improve your firearms wear, corrosion and erosion resistance; sliding friction, scuffing resistance and overall cosmetic appeal. HEF offerings for Firearm applications include the following: • MELONITE® and ARCOR® QPQ / Salt Bath Nitriding • Physical Vapor Deposition (PVD) Coatings • Diamond-like-Carbon (DLC) Coatings • REM Super-finishing • Manganese Phosphating • Electroless Nickel Plating HEF Group, through its various facilities in the US and Canada, is the largest and most diverse provider of innovative surface treatments, coatings and finishes to the Firearms industry. Our facilities are located in all key geographic regions of the US where firearms manufacturing is prevalent. Our extensive experience and expertise with not only firearms, but also precision engineered mechanical components, makes us an excellent partner to customize our surface en- gineering technology to the customer’s specific needs and requirements. Our engineering strengths, along with operational responsiveness and competitive pricing, makes HEF an excel- lent choice to be the Firearm industries comprehensive supplier for a diverse range pf perfor- mance enhancing surface treatments and coatings. MELONITE® & ARCOR® Liquid Nitriding Liquid Nitriding is a thermo-chemical diffusion treatment that enriches the surface of steels and cast iron with Nitrogen.
    [Show full text]
  • A Crystallochemical Study of Gersdorffite and Related
    A CRYSTALLOCHEMICAL STUDY OF GERSDORFFITE AND RELATED MINERALS A thesis presented in 1968 to The University of New South Wales for the Degree of Doctor of Philosophy This thesis has not been previously presented in whole or part to another University or Institution for a higher degree Peter Bayliss (ii) CONTENTS Page Summary 1. Introduction 3. Literature Survey: Crystal structure 5. Physical properties: 9 • Electrical and magnetic properties 9. Bonds and atomic radii 12. Order-disorder and forbidden reflections 13. Thermodynamic properties 14. Gersdorffite: Crystallography 15. Chemistry 16. Cobaltite: Crystallography 18. Chemistry 21. Ullmannite: Crystallography 22. Chemistry 22. Arsenopyrite: Crystallography 24. Chemistry 26. Glaucodot: Crystallography 27. Chemistry 28. Gudmundite: Crystallography 29. Chemistry 30. Literature review 31. (iii) Page Methods: Synthesis 33. X-ray diffraction of synthetic powder 37. Natural powder examination 42. Single crystal X-ray diffraction 43. Crystal structure computations 47. Results: Gersdorffite: Natural material 49. Crystal structure Slovakia Pa3 54. Wolfsberg P213 55. Leichtenberg PI 58. Synthesis 62. Cobaltite: Natural material 64. Crystal stxucture 66. Synthesis 67. Ullmannite: Natural material 69. Crystal structure 70. Synthesis 72. Arsenopyrite, glaucodot and gudmundite: Natural material 73. Synthesis 74. Pyrite, cattierite and vaesite 74. (iv) Page Discussion: Methods 76. Natural material 77. Synthesis 78. Bernd angles and distances 80. Crystal structure accuracy 83. Crystal structure 85. Crystal structure relations 87. Acknowledgments 94. References 95. Data appendix: Unit cell data 107. X-ray diffraction powder intensities, optical anisotropy, zoning and paragenesis 114. Crystallographic data 118. Chemical data 133. Heating experiments 135. Publication List 137. (v) LIST OF TABLES Page 1. Unit Cell Data la.
    [Show full text]
  • Types of Tellurium Mineralization of Gold Deposits of the Aldan Shield (Southern Yakutia, Russia)
    minerals Article Types of Tellurium Mineralization of Gold Deposits of the Aldan Shield (Southern Yakutia, Russia) Larisa A. Kondratieva *, Galina S. Anisimova and Veronika N. Kardashevskaia Diamond and Precious Metal Geology Institute, SB RAS, 677000 Yakutsk, Russia; [email protected] (G.S.A.); [email protected] (V.N.K.) * Correspondence: [email protected]; Tel.: +7-4112-33-58-72 Abstract: The published and original data on the tellurium mineralization of gold ore deposits of the Aldan Shield are systematized and generalized. The gold content is related to hydrothermal- metasomatic processes caused by Mesozoic igneous activity of the region. The formation of tellurides occurred at the very late stages of the generation of gold mineralization of all existing types of meta- somatic formations. 29 tellurium minerals, including 16 tellurides, 5 sulfotellurides and 8 tellurates have been identified. Tellurium minerals of two systems predominate: Au-Bi-Te and Au-Ag-Te. Gold is not only in an invisible state in sulfides and in the form of native gold of different fineness, but also is part of a variety of compounds: montbrayite, calaverite, sylvanite, krennerite and petzite. In the gold deposits of the Aldan Shield, three mineral types are distinguished: Au-Ag-Te, Au-Bi-Te, and also a mixed one, which combines the mineralization of both systems. The decrease in the fineness of native gold is consistent with the sequence and temperatures of the formation of Te minerals and associated mineral paragenesis from the epithermal–mesothermal Au-Bi-Te to epithermal Au-Ag-Te. The conducted studies allowed us to determine a wide variety of mineral species and significantly ex- Citation: Kondratieva, L.A.; pand the area of distribution of Au-Te mineralization that indicates its large-scale regional occurrence Anisimova, G.S.; Kardashevskaia, in the Aldan Shield.
    [Show full text]
  • Dana's Text-Book of Mineralogy, 1922
    SULPHIDES, SELENIDES, TELLURIDES, ARSENIDES, ANTIMONIDES 357 11. SULPHIDES, SELENIDES, TELLURIDES, ARSENIDES, ANTIMONIDES The sulphides, etc., fall into two Groups according to the character of the positive element. I. Sulphides, Selenides, Tellurides of the Semi-metals. II. Sulphides, Selenides, Tellurides, Arsenides, Antirnonides of the Metals. I. Sulphides, etc., of the Semi-Metals This section includes one distinct group, the Stibnite Group, to which orpiment is related; the other species included stand alone. 637 REALGAR. Monoclinic. Axes a : b : c = 1.4403 : 1 : 0.9729;0 = 66" 5'. mm"', 110 A 110 = 105" 34'. rr', 012 A 072 = 47' 57'. Crystals short prismatic; striated vertically. Also gran- ular, coarse or fine; compact; as an incrustation. Cleavage : b(010) rather perfect. Fracture small con- choidal. Sectile. H. = 1.5-2. G. = 3.56. Luster resinous. Color aurora-red or orange-yellow. Streak varying from orange-red to aurora-red. Transparent - translucent. Comp. - Arsenic monosulphide, ASS = Sulphur 29'9, arsenic 70'1 = 100. Pyr., etc. - In the closed tube melts and gives a dark red li uid when hot and a red- dish yellow solid when cold; in the open tube (if heated ver slow? ) sulphurous fumes, and a whlte crystalline sublimate of arsenic trioxide. B.B. on ciarcoaTburm with a blue Hame, emitting arsenical and sulphurous odors. Soluble in caustic alkalies. Artif. - Realgar is frequently noted as a sublimation product from furnaces roasting ores of arsenic. Crystals are produced when arsenic sulphide is heated in a sealed tube with a solution of sodium bicarbonate. Obs. - Realgar occurs usually in veins associated with silver and lead ores.
    [Show full text]
  • Thn Auertcan Mrneralocrsr
    THn AUERTcANMrNERALocrsr JOURNAL OF THE MINERALOGICAL SOCIETY OF AMERICA Vol.34 MAY-JUNE, 1949 Nos. 5 and 6 Contributions to CanadianMineralogy Volume 5, Part I 'Walker Sponsored.by The Mineralogical Club Edited by M. A. Peacock, Toronto Fonnwono In 192I, shortly after the organization of the Mineralogical Society of America (December 30, 1919), Professor T. L. Walker (1867-1942) and ProfessorA. L. Parsons(now emeritus)-both charter fellows and in later years presidents of the Society-founded Contribfitions to Canad,ian Min- eralogyfrom the Department of Mineralogy and Petrography, University of Toronto. This annual publication was conducted by ProfessorsWalker and Parsonsand, since I94I,by ProfessorM. A. Peacock; and from l92l to 1948 it has appeared without interruption in the GeologicalSeries ol the Uniaersity of Toronto Studies. Since the founding of the Walker Min- eralogical Club in 1938, the periodical has been sponsoredby the Club as well as by the University; and after the u4ion of the Department of Mineralogy and Petrography and the Department of Geology and Palaeontologyin 1945,the Canadian journal was issuedby the combined Department of Geological Sciencesand the Walker Mineralogicat Club. At the November 1948 meeting of the Council of the Mineralogical Society of America, Professor(then President) Peacockreported that the University of Toronto had decided to terminate the Uniaersity oJ Toronto Stud.ieswhich, as a whole, had greatly declined, and that no practical way had been found to continue the publication of Contributions to Canadian Mineralogy in Canada. fn order to preservethe continuity and integrity of the Canadian Journal, the Council agreedto devote a regular issue of the American Mineralogist to a collection of papers by Canadian mineralogists,to be assembledand edited by Professor Peacockin consul- tation with the Editor oI the American Mineralogist.
    [Show full text]
  • The Cascade Slide: a Mineralogical Investigation of a Calc-Silicate Body on Cascade Mountain, Town of Keene, Essex County, New York
    THE CASCADE SLIDE : A MINERALOGICAL INVESTIGATION OF A CALC-SILICATE BODY ON CASCADE MOUNTAIN, TOWN OF KEENE I ESSEX COUNTY I NEW YORK BY THOMAS A. BAitLIEUL CONTRIBUTION NO . 27 GEOLOGY DEPARTMENT UNIVERSITY OF MASSACHUSETTS AMHERST , MASSACHUSETTS THE CASCADE SLIDE: A MINERALOGICAL INVESTIGATION OF A CALC-SILICATE BODY ON CASCADE MOUNTAIN, TOWN OF KEENE, ESSEX COUNTY, NEW YORK by Thomas A. Baillieul Contribution No. 27 Department of Geology University of Massachusetts Amherst, Massachusetts May, 1976 r--- iii TABLE OF CONTENTS ABSTRACT 1 INTRODUCTION 2 Location...................................................... 2 Previous Work 2 Field Work 4 Methods 5 Acknowledgements 8 GENERAL GEOLOGY 9 PETROGRAPHY 14 Augite and monticellite marble 14 Scapolite gneiss and granulite 16 Wollastonite - garnet granulite 19 Augite granulite 21 Augite-garnet gneiss 23 Pyroxene-microperthite gneiss and anorthosite 24 MINERALOGY 29 Calcite 29 Augite 38 Scapolite 57 Garnet 66 Wollastonite 73 Monticellite ............ ·.- ................................... 79 Olivine ...................................................... 85 Vesuvianite .................................................. 88 iv Apatite . .. 94 Titanite (sphene) ........................................... 101 Graphite 102 Magnetite . • . • • . • . • • • . • . • • . • . • • . • . • . • • . • . 104 Spinel . 106 Harkerite . 109 Phlogopi te .•.........••..•..•...•...••..... ,• • . • • . • . • . 112 Ilmenite .--.. 114 Perovskite .............................. ,. 115 CRYSTAL SURFACE TEXTURES 117 COMPARISONS
    [Show full text]