Chabazite

Formula:  CaAl₂Si₄O₁₂ ^. 6H₂O

Origin of name:  Form Greek chabazois - stone

Crystal system:  Triclinic, pseudo-hexagonal

Crystal class:  -1

Twinning:  Common about [1000] axis, penetration or repeated; on {10-11} contact

Unit cell: a = 9.43 Ǻ, b = 9.43 Ǻ, c = 9.43 Ǻ, α = 94.2°, β = 94.2°, γ = 94.2°

Colour:  Colourless, white, yellowish, pinkish, reddish white, greenish

Diaphaneity:

Luster:  Vitreous

Habit:  Crystals simple rhombohedrons, resemble cubes, may be complex tabular

Hardness:  4 to 5

Specific gravity:  2.05 to 2.16

Cleavage:  1; {100} distinct

Tenacity:  Uneven; brittle

Streak:  Colourless

Synonyms/varieties:  Cabasite, Phacolite (twinned var.), glottalite

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