Formula: CaAl2Si2O8
Origin of name: for Svyatoslav Ivanov, Russian geologist
Crystal system: orthorhombic , may actually be monoclinic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster: vitreous
Habit: crystals prismatic 0.5 to 0.8 mm
Hardness: 6
Specific gravity: 2.695
Cleavage: 1; {001} weak
Tenacity:
Streak: white
Synonyms/varieties:
Comments: dimorphous with anorthite, fluoresces weakly yellowish, member of the feldspar group
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