Formula: Ca2Al3(SiO4)3(OH)
Origin of name: for S. Zois, Austrian scholar
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 16.15 Å, b = 5.581 Å, c = 10.06 Å
Colour: gray, white, greenish gray, greenish brown, green, pink, colourless
Diaphaneity:
Luster: vitreous, may be pearly on cleavage
Habit: prismatic, deeply striated vertically, massive, compact or columnar
Hardness: 6.5 to 7
Specific gravity: 3.55
Cleavage: 2; {100} perfect, {010} imperfect
Tenacity: conchoidal to uneven, brittle
Streak: colourless
Synonyms/varieties:
Comments: dimorphous with clinozoisite
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