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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,wiistite,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:5(1/2)-6.Tenacity:brittle.Cleavage:{0 0 1} perfect.Fracture:conchoidal.Chemical formula: (Cr_4Fe_4Ni)_(Σ9)C_4,or (Cr,Fe,Ni)_(Σ9)C_4,Crystal system:Hexagonal,Space Group:P6_3/mc,a = 18.839(2) (?),c = 4.4960 (9) (?),,V = 745.7(2) (?)~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).
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, native iron, native nickel, native chromium, forsterite, Cr-rich diopside, intermetallic compounds Ni-Fe-Cr, osmium (“iridosmine” 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-gray color, H Mohs: 5 (1/2) -6.Tenacity: brittle.Cleavage: {0 0 1} perfect.Fracture: conchoidal.Chemical formula: (Cr_4Fe_4Ni (Σ9) C_4, or (Cr, Fe, Ni) _ (Σ9) C_4, Crystal system: Hexagonal, Space Group: P6_3 / mc, a = 18.839 (2) ?) ,, V = 745.7 (2) (?) ~ 3, Z = 6, Densi (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) .