Formula: Na2-XHXZrSi2O7·nH2O
Origin of name: For M. Keldysh, Russian mathematician
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 6.66, b = 8.33, c = 5.42, α = 92.75°, β = 94.217°, γ = 72.33°
Colour: White
Diaphaneity: Transparent in thin fragments, translucent
Luster: Vitreous to greasy
Habit: Irregular grains to 4 mm
Hardness: 3.5 to 4.5
Specific gravity: ~ 3.3
Cleavage: 2; poor, intersect at 90°
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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