Formula: NaHSi2O5 . H2O
Origin of name: From old Russian name for the Spitsbergen Archipelago
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: White
Diaphaneity: Transparent
Luster: Vitreous
Habit:
Hardness: 4 to 5
Specific gravity: 2.21
Cleavage: 1; {110} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Weak bluish white fluorescence
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