Formula: K2Ca(SO4)2.H2O
Origin of name: from Greek for related
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless, white
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals tabular or prismatic, striated, highly modified, twinning common, to several cm
Hardness: 2.5
Specific gravity: 2.60
Cleavage: 3; {110} and {100} perfect, {010} distinct
Tenacity: conchoidal
Streak:
Synonyms/varieties:
Comments:
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