Formula: Na6(Ca,Mn)(Ti,Fe)Si6O18 . H2O
Origin of name: Locality; Mt. Koashva, Kola Peninsula, Russia
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Pale yellow
Diaphaneity: Transparent
Luster: Vitreous
Habit: Veinlets
Hardness: 6
Specific gravity: 2.98 to 3.02
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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