Formula: Ca2Al2SiO6(OH)2
Origin of name: Locality; Bicchu, Okoyama Pref., Japan
Crystal system: Cubic
Crystal class: -43m
Twinning:
Unit cell: a = 8.82-8.83 Å
Colour: Colourless
Diaphaneity: Semitransparent
Luster: Powdery, earthy
Habit: Fine powder
Hardness:
Specific gravity: 2.75
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with kamaishilite. Found in skarns in limestones, formed through alteration of gehlenite subjected to later retrograde hydration reactions.
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