NDLI: Mineral CuFe$_{2}$S$_{4}$ from sulfide Copper–Nickel ores of the Lovnoozero deposit, Kola Peninsula

Content Provider	Springer Nature Link
Author	Orsoev, D. A. Kanakin, S. V. Pakhomovsky, Ya. A. Ushchapovskaya, Z. F. Reznitsky, L. Z.
Copyright Year	2016
Abstract	The unnamed mineral CuFe$_{2}$S$_{4}$ has been found from sulfide Cu–Ni ores of the Lovnoozero deposit in the Kola Peninsula, Russia. It occurs in norite composed of orthopyroxene (bronzite), Ca-rich plagioclase (66% An), pargasite, and phlogopite. The last two minerals are replaced by talc, chlorite and carbonates. Monoclinic pyrrhotite, pentlandite, chalcopyrite, and pyrite are associated ore minerals. Phase CuFe$_{2}$S$_{4}$ is enclosed predominantly in chalcopyrite, probably replacing it, and occurs in later carbonate veinlets together with redeposited sulfides. It is light yellow with a brownish tint and metallic luster. The Mohs hardness is 5–5.5; VHN 654 ± 86 kgs/mm$^{2}$. Density (calc.) = 4.524 g/cm$^{3}$. The mineral is anisotropic, internal reflections are absent. Reflectance values (λ, nm R′$_{ g }$ and R′$_{ p }$ %) are: 440 30.3 29.5, 500 43.7 42.8, 560 50.9 49.6, 620 52.4 51.2, 640 52.6 51.4, 680 52.8 51.6, 700 52.7 51.4. CuFe$_{2}$S$_{4}$ is monoclinic, a = 6.260(4), b = 5.39(1), c = 13.19(1) Å, β = 94.88(7)°, V = 443(1) Å$^{3}$, Z = 4. The strongest reflections in the powder diffraction pattern are [d, Å (I) (hkl)]: 4.150 (10) (012), 3.559 (4) ( $$11\bar 2$$ ), 3.020 (4) ( $$10\bar 4$$ ), 2.560 (3) ( $$21\bar 2$$ ), 2.500 (3) ( $$10\bar 5$$ ), 2.340 (3) ( $$12\bar 2$$ ), 1.817 (3) (215), 1.489 (3) (402). The chemical composition is as follows, wt %: 20.44 Cu, 35.85 Fe, 0.65 Ni, 0.14 Co, 43.15 S, total is 100.23. The empirical formula calculated on the basis of 7 atoms is Cu$_{0.969}$(Fe$_{1.934}$Ni$_{0.034}$Co$_{0.007}$)$_{1.975}$S$_{4.056}$. According to its mode of occurrence, the mineral was formed as a result of low temperature processes involving metamorphic hydrothermal solutions.
Starting Page	579
Ending Page	585
Page Count	7
File Format	PDF
ISSN	10757015
Journal	Geology of Ore Deposits
Volume Number	58
Issue Number	7
e-ISSN	15556476
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-02-08
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geology Economic Geology Geochemistry and Petrology

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