Formula: Ca2Al3(SiO4)3(OH)
Origin of name: From monoclinic and zoisite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Uncommon on {100}, lamellar
Unit cell: a = 8.86 Ǻ, b = 5.59 Ǻ, c = 10.12 Ǻ, β = 115.4°
Colour: Colourless, pale yellow, light brown, gray, green, pink, pink-red
Diaphaneity:
Habit: Crystals short to long prismatic, deeply striated; acicular, massive, coarse to fine granular; fibrous, parallel, divergent
Hardness: 6.5
Specific gravity: 3.21 to 3.38
Cleavage: 1; {001} perfect
Streak: Colourless, greyish
Synonyms/varieties:
Comments: Series with epidote; dimorphous with zoisite
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