Clinoptilolite

Formula:  (Na,K,Ca)_2-3Al₃(Al,Si)₂Si₁₃O₃₆ ^. 12H₂O

Origin of name:  From monoclinic and Greek for down (Feather)

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 17.63 Ǻ, b = 17.94 Ǻ, c = 7.40 Ǻ, β = 116.4°

Colour:  Colourless, white

Diaphaneity:  Transparent to translucent

Luster:  Vitreous

Habit:  Crystals platy, minute, in clusters

Hardness:  3.5 to 4

Specific gravity:  2.1 to 2.2

Cleavage:  1; {010} perfect

Tenacity:

Streak:

Synonyms/varieties:

Comments: