Anduoite

Formula:  (Ru, Os)As₂

Origin of name:  After locality; Anduo deposit, Tibet, China

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m or mm2

Twinning:

Unit cell: a = 5.41 Å, b = 6.206 Å, c = 3.01 Å

Colour: Dull lead-gray

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Submicroscopic massive grains  or granular aggregates

Hardness:  6.5 to 7

Specific gravity:  8.69 (calculated)

Cleavage:  None

Tenacity: Brittle

Streak:  Grayish black

Synonyms/varieties:

Comments:  Series with omeiite. In chromium deposit related to augite peridotite and dunite