Formula: NaBa3(Mn,Mn)4Si6O19(OH)3
Origin of name: for N.M. Strakhov, Russian petrologist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: black with greenish tint
Diaphaneity: translucent
Luster: vitreous to greasy
Habit: grains to 0.7 mm
Hardness: 5 to 6
Specific gravity: 3.86
Cleavage: 1; {110} imperfect
Tenacity:
Streak: olive green
Synonyms/varieties:
Comments:
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