Formula: (Os,Ru)As2
Origin of name: after locality Omeishan mountain, Sichuan, China
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: dull steel-gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals prismatic tabular, 20 micron
Hardness:
Specific gravity: 11.20
Cleavage: 1; parallel to elongation
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with anduoite
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