Formula: Ca2B5O9(OH).H2O
Origin of name: after locality Tyretsk Station, Siberia, Russia
Crystal system: triclinic
Crystal class: 1
Twinning:
Unit cell: a = 6.3, b = 6.47, c = 6.56, α = 74.27°, β = 61.6°, γ = 61.25°
Colour: White, brownish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Massive, radiating fibrous aggregates
Hardness: 5
Specific gravity: 2.19
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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