Kukisvumite

Formula:  Na₆ZnTi₄Si₈O₂₈ ^. 4H₂O

Origin of name:  From locality; Kikisvumchorr deposit, Kila Peninsula, Russia

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning: 

Unit cell: a = 28.889, b = 8.604, c = 5.215

Colour:  White to colourless

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Long prismatic crystals to 7 mm in fan-shaped intergrowths

Hardness:  5.5 to 6

Specific gravity:  2.90

Cleavage:  1; {010} parting

Tenacity: 

Streak:  White

Synonyms/varieties:

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