Formula: CaTiSiO5
Origin of name: from composition
Crystal system: monoclinic
Crystal class: 2/m
Twinning: common on {100} contact or penetration, less common on {122} lamellar
Unit cell: a = 7.07 Å, b = 8.71 Å, c = 6.56 Å, b = 113.9°
Colour: colourless, yellow, green, gray, brown, rose-red, black, pinkish
Diaphaneity:
Luster: adamantine to resinous
Habit: crystals wedge-shaped or prismatic, twinned, massive, compact or lamellar
Hardness: 5 to 5.5
Specific gravity: 3.45 to 3.55
Cleavage: 2; {110} dinstinct, {221} parting
Tenacity:
Streak: white
Synonyms/varieties: keilhauite (Y-rich variety), sphene
Comments:
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