Formula: CaB2(SiO4)2
Origin of name: Locality; Danbury, Connecticut
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 8.041 Å, b = 8.760 Å, c = 7.737 Å
Colour: Colourless, white, pale pink, yellow, yellowish brown, brown
Diaphaneity:
Luster: Vitreous to somewhat greasy
Habit: Crystals prismatic, diamond-shaped cross section, wedge-like or pointed termination, vertical striations; massive
Hardness: 7
Specific gravity: 2.97 to 3.02
Cleavage: 1; {001} indistinct
Tenacity: Conchoidal; brittle
Streak: Colourless
Synonyms/varieties:
Comments:
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