Formula: SiO2
Origin of name: for S. Stishov, Russian crystallographer
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: massive, fine granular
Hardness:
Specific gravity: 4.35
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: polymorphous with quartz, tridymite, cristobalite and coesite, Si is in 6-fold coordination
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