Formula: (K,Ba)Al(Si,Al)3O8
Origin of name: From Greek for glass and to appear
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white, yellow
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals prismatic, orthorhombic aspect; massive
Hardness: 6.6 to 5
Specific gravity: 2/58 to 2.88
Cleavage: 2; {001} perfect, {010} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Intermediate member of the orthoclase-celsian series
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