Formula: CaMgSiO4
Origin of name: For T. Monticelli, Italian mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless, gray, greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals prismatic; massive, granular; disseminated grains
Hardness: 5.5
Specific gravity: 3.08 to 3.27
Cleavage: 1; {010} indistinct
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Series with kirschsteinite
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