Formula: (Ca,Na)(Fe,Mg,Al)Si2O6
Origin of name: from Greek for unripe grapes
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Grass-green, dark green
Diaphaneity: translucent
Luster: vitreous to silky
Habit: massive, granular to foliated
Hardness: 5 to 6
Specific gravity: 3.29 to 3.39
Cleavage: 2; {110} good, {100} parting
Tenacity:
Streak:
Synonyms/varieties:
Comments: solid solution of aegirine, augite and jadeite
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