Formula: Ca2(Fe,Al)3(Si2O7)(SiO4)(O,OH)2
Origin of name: From Greek for increase
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {100}, contact or lamellar
Unit cell: a = 8.90 Ǻ, b = 5.63 Ǻ, c = 10.20 Ǻ, β = 115.4°
Colour: Yellowish green to brownish to dark green, gray, grayish
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals short to long prismatic, may be deeply striated; thick tabular; acicular; massive, coarse to fine granular; fibrous
Hardness: 6 to 7
Specific gravity: 3.35 to 3.5
Cleavage: 1; {001} perfect
Tenacity: Uneven; brittle
Streak: Colourless to grayish
Synonyms/varieties:
Comments: Series with clinozoisite
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