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Yarlongite: A New Metallic Carbide Mineral
Author(s) -
SHI Nicheng,
BAI Wenji,
LI Guowu,
XIONG Ming,
FANG Qingsong,
YANG Jingsui,
MA Zhesheng,
RONG He
Publication year - 2009
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2009.00007.x
Subject(s) - chromite , chromitite , mineral , materials science , metallurgy , carbide , osmium , mineralogy , geology , ruthenium , ophiolite , chemistry , paleontology , biochemistry , tectonics , catalysis
Yarlongite occurs in ophiolitic chromitite at the Luobusha mine (29°5′N 92°5′E, about 200 km ESE of Lhasa), Qusum County, Shannan Prefecture, Tibet Autonomous Region, People's Republic of China. Associated minerals are: diamond, moissanite, wüstite, iridium (“osmiridium”), osmium (“iridosmine”), periclase, chromite, native iron, native nickel, native chromium, forsterite, Cr‐rich diopside, intermetallic compounds Ni‐Fe‐Cr, Ni‐Cr, Cr‐C, etc. Yarlongite and its associated minerals were handpicked from a large heavy mineral sample of chromitite. The metallic carbides associated with yarlongite are cohenite, tongbaite, khamrabaevite and qusongite (IMA2007–034). Yarlongite occurs as irregular grains, with a size between 0.02 and 0.06 mm, steel‐grey colour, H Mohs: 5½–6. Tenacity: brittle. Cleavage: {0 0 1} perfect. Fracture: conchoidal. Chemical formula: (Cr 4 Fe 4 Ni) Σ9 C 4 , or (Cr,Fe,Ni) Σ9 C 4 , Crystal system: Hexagonal, Space Group: P 6 3 /mc, a = 18.839(2) Å, c = 4.4960 (9) Å, V = 745.7(2) Å 3 , Z = 6, Density (calc.) = 7.19 g/cm 3 (with simplified formula). Yarlongite has been approved as a new mineral by the CNMNC (IMA2007–035). Holotype material is deposited at the Geological Museum of China (No. M11650).