Formula: KCa4[B5O8(OH)]4[B(OH)3]2Cl.4H2O
Origin of name: for A. Volkovskaya, Russian petrographer
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 6.58, b = 23.937, c = 6.521, α = 90.4°, β = 119.09°, γ = 95.67°
Colour: Colourless, light orange, pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Platy, elongated to 1.5 mm, massive, subspherical, granular, micaceous pseudohexagonal to triangular plates, may be in booklike aggregates
Hardness: 2.5
Specific gravity: 2.27 to 2.34
Cleavage: 2; {010} perfect
Tenacity: Brittle, splintery
Streak: White
Synonyms/varieties:
Comments:
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