Taikanite

Formula: BaSr₂Mn₂O₂(Si₄O₁₂)

Origin of name: after locality Taikan Mountains, Russia

Crystal system: Monoclinic

Crystal class: 2

Twinning: Observed in thin section

Unit cell: a = 14.6, b = 7.759, c = 5.142, β = 93.25°

Colour: Greenish black, emerald-green

Diaphaneity: Translucent to opaque

Luster: Vitreous to greasy

Habit: equant grains, to tenths of mm rarely elongated to 1.6 mm, twinned

Hardness: 6-7

Specific gravity: 4.72

Cleavage: 1; {001} perfect

Tenacity: Brittle, conchoidal fracture

Streak: 

Synonyms/varieties:

Comments: