Abstract: A group of mantle minerals including about 70–80 subtypes of minerals are discovered from a podiform chromitite in Tibet, China. Recovered minerals include diamond, coesite, moissanite, wustite, Fe‐silides and a new mineral, luobusaite. All of these minerals were hand‐picked from heavy‐mineral separates of the podiform chromitite in the mantle peridotite of an ophiolite. The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe‐Si phase. Luobusaite occurs as irregular grains, with 0.1–0.2 mm in size, consisting of very finegrained aggregates. The mineral is steel‐grey in color, metallic luster, and opaque. The empirical formula (based on 2 for Si) is Fe0.83Si2, according to the chemical compositions of luobusaite. X‐ray powder‐diffraction data: orthorhombic system, space group Cmca, a = 9.874 (14) Å, b = 7.784 (5) Å, c = 7.829(7) Å, Z=16.
[1]
J. Malpas,et al.
Aspects of the Tectonic Evolution of China
,
2004
.
[2]
J. Malpas,et al.
THE PGE AND BASE-METAL ALLOYS IN THE PODIFORM CHROMITITES OF THE LUOBUSA OPHIOLITE, SOUTHERN TIBET
,
2000
.
[3]
E. Froese,et al.
Cordierite-anthophyllite-cummingtonite rocks from the Lar Deposit, Laurie Lake, Manitoba
,
2000
.
[4]
P. Robinson,et al.
Possibly diamond-bearing mantle peridotites and podiform chromitites in the Luobusa and Donqiao ophiolites, Tibet
,
1993
.