Formula: Bi12SiO20
Origin of name: for Lars Sillen, Sweden
Crystal system: cubic
Crystal class: 23
Twinning:
Unit cell:
Colour: yellow-green, green, grayish green, brownish green
Diaphaneity: translucent to transparent (thin fragments)
Luster: adamantine
Habit: massive, fine-grained, earthy
Hardness: 1
Specific gravity: 9.30
Cleavage: none
Tenacity:
Streak: light yellowish to brownish
Synonyms/varieties:
Comments:
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