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Geology of Ore Deposits

, Volume 53, Issue 8, pp 758–766 | Cite as

Cuprokalininite, CuCr2S4, a new sulfospinel from metamorphic rocks of the Sludyanka Complex, South Baikal region

  • L. Z. ReznitskyEmail author
  • E. V. Sklyarov
  • Z. F. Ushchapovskaya
  • L. F. Suvorova
  • Yu. S. Polekhovsky
  • P. Dzerzanovsky
  • I. G. Barash
Article

Abstract

Cuprokalininite as an accessory mineral has been found in Cr-V-bearing quartz-diopside metamorphic rock of the Sludyanka Complex, South Baikal region, Russia. This mineral is named as Cu analogue of kalininite (ZnCr2S4), is associated with quartz, Cr-V-bearing tremolite and mica, calcite, diopside-kosmochlor, goldmanite-uvarovite, dravite-chromdravite, Cr-V spinellide, karelianite-eskolaite, V-bearing titanite, pyrite, and plagioclase. Cuprokalininite forms euhedral microcrystals up to 0.05–0.20 mm in size, of octahedral and cuboctahedral habit with faces o {111} and a {100}, and polysynthetic and simple twinning along the {111}. Cleavage and parting were not observed. The mineral is black with a dark bronze tint, black streak, and metallic luster. The microhardness (VHN) is 356–458 (loadings are 20 and 30 g), 396 kgf/mm2, on average. The Mohs hardness is 4.5–5.0, d calc = 4.16(2). In reflected light, the mineral is pale-cream-colored, without anisotropy; reflectance values (λ, nm-R, %): 400-34.3, 420-34.1, 440-33.9, 460-33.7, 480-33.5, 500-33.2, 520-33.0, 540-32.8, 560-32.3, 580-32.2, 600-31.9, 620-31.6, 640-31.2, 660-30.9, 680-30.6, 700-30.4. Cubic, space group Fd \(\bar 3\) m, Z = 8; unit cell parameter a = 9.814(2) Å, V = 945.2(4) Å3. The strongest lines of the X-ray powder diffraction pattern [d, Å (I) (hkl)]: 3.44 (6)(220), 2.94 (10)(311), 2.44 (6)(400), 1.884 (9)(511, 333), 1.731 (10)(440), 1.133 (6)(751, 555), 1.098 (6)(840), 1.030 (6)(931), 1.002 (10)(844). Chemical composition (mean of 202 microprobe analyses of 11 grains, wt %): Cu 21.03, Fe 0.47, Zn 0.17, Cr 29.01, V 5.85, As 0.21, Sb 0.08, S 43.25; the total is 100.07. The empirical formula calculated on the basis of seven ions is (Cu0.98Fe0.02Zn0.01)1.01(Cr1.65V0.34As0.01)2.00S3.99. The type material has been deposited at the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia.

Keywords

Tourmaline Diopside Unit Cell Dimension Polysynthetic Twin Mohs Hardness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • L. Z. Reznitsky
    • 1
    Email author
  • E. V. Sklyarov
    • 1
  • Z. F. Ushchapovskaya
    • 1
  • L. F. Suvorova
    • 2
  • Yu. S. Polekhovsky
    • 3
  • P. Dzerzanovsky
    • 4
  • I. G. Barash
    • 1
  1. 1.Institute of the Earth’s Crust, Siberian BranchRussian Academy of SciencesIrkutskRussia
  2. 2.Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  3. 3.Faculty of GeologySt. Petersburg State UniversitySt. PetersburgRussia
  4. 4.Institute of Geochemistry, Mineralogy, and PetrologyWarsaw UniversityWarsawPoland

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