Tetrahedrite-(Ni), Cu6(Cu4Ni2)Sb4S13, the first nickel member of tetrahedrite group mineral from Luobusa chromite deposits, Tibet, China
-
Yanjuan Wang
, Rujun Chen
, Zengqian Hou
Abstract
Tetrahedrite-(Ni) (IMA2021-031), ideally Cu6(Cu4Ni2)Sb4S13, is the first natural Ni-member of tetrahedrite group mineral found in Luobusa chromite deposit, Tibet, China. The new species occurs as anhedral grains 2 to 20 μm in size, associated with gersdorffite, vaesite, and chalcostibite, which are disseminated in a matrix of dolomite, magnesite, quartz, Cr-rich mica, and Cr-bearing clinochlore. Tetrahedrite-(Ni) is black in color with a reddish-black streak and metallic luster. It is brittle with uneven fractures and has a calculated density of 5.073 g·cm–3. The mean values of 9 electron micro-probe analyses (wt%) are Cu 39.83, Ni 5.67, Fe 1.45, Sb 21.69, As 5.45, S 25.39, total 99.48, and the empirical formula calculated on the basis of cation = 16 apfu is M(2)Cu6.00M(1)[Cu4.03(Ni1.55Fe0.42)Σ1.97]Σ6.00 X(3)(Sb2.85As1.16)Σ4.01S12.67. Tetrahedrite-(Ni) is cubic, with space group I43m, a = 10.3478(4) Å, V = 1108.00(14) Å3, and Z = 2. Its crystal structure has been solved by X-ray single-crystal diffraction on the basis of 188 independent reflections, with a final R1 = 0.0327. Tetrahedrite-(Ni) is isostructural with tetrahedrite group minerals. It represents the first natural tetrahedrite-group mineral with a Ni-dominated charge-compensating constituent. Tetrahedrite-(Ni) may be the product of late-serpentinization at moderately high-temperature conditions around 350 °C. In this case, tetrahedrite-(Ni) and its mineral paragenesis record an entire geological process of nickel enrichment, migration, activation, precipitation, and alteration from deep mantle to shallow crust.
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Articles in the same Issue
- Heavy halogen compositions of lamprophyres derived from metasomatized lithospheric mantle beneath eastern North China Craton
- Compositional trends in Ba-, Ti-, and Cl-rich micas from metasomatized mantle rocks of the Gföhl Unit, Bohemian Massif, Austria
- Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa
- The use of boron nitride to impose reduced redox conditions in experimental petrology
- Structures and transport properties of supercritical SiO2-H2O and NaAlSi3O8-H2O fluids
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- Witness to strain: Subdomain boundary length and the apparent subdomain boundary density in large strained olivine grains
- Libyan Desert Glass: New evidence for an extremely high-pressure-temperature impact event from nanostructural study
- Crystal vs. melt compositional effects on the partitioning of the first-row transition and high field strength elements between clinopyroxene and silicic, alkaline, aluminous melts
- Microbially induced clay weathering: Smectite-to-kaolinite transformation
- Hydrous wadsleyite crystal structure up to 32 GPa
- Multiple fluid sources in skarn systems: Oxygen isotopic evidence from the Haobugao Zn-Fe-Sn deposit in the southern Great Xing’an Range, NE China
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- New Mineral Names: Heavy metal and minerals from China
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Articles in the same Issue
- Heavy halogen compositions of lamprophyres derived from metasomatized lithospheric mantle beneath eastern North China Craton
- Compositional trends in Ba-, Ti-, and Cl-rich micas from metasomatized mantle rocks of the Gföhl Unit, Bohemian Massif, Austria
- Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa
- The use of boron nitride to impose reduced redox conditions in experimental petrology
- Structures and transport properties of supercritical SiO2-H2O and NaAlSi3O8-H2O fluids
- Hydrologic regulation of clay-mineral transformations in a redoximorphic soil of subtropical monsoonal China
- Witness to strain: Subdomain boundary length and the apparent subdomain boundary density in large strained olivine grains
- Libyan Desert Glass: New evidence for an extremely high-pressure-temperature impact event from nanostructural study
- Crystal vs. melt compositional effects on the partitioning of the first-row transition and high field strength elements between clinopyroxene and silicic, alkaline, aluminous melts
- Microbially induced clay weathering: Smectite-to-kaolinite transformation
- Hydrous wadsleyite crystal structure up to 32 GPa
- Multiple fluid sources in skarn systems: Oxygen isotopic evidence from the Haobugao Zn-Fe-Sn deposit in the southern Great Xing’an Range, NE China
- Crocobelonite, CaFe23+(PO4)2O, a new oxyphosphate mineral, the product of pyrolytic oxidation of natural phosphides
- Tetrahedrite-(Ni), Cu6(Cu4Ni2)Sb4S13, the first nickel member of tetrahedrite group mineral from Luobusa chromite deposits, Tibet, China
- New Mineral Names: Heavy metal and minerals from China
- Book Review