Formula: Ca3Mg(SiO4)2
Origin of name: For H. Merwin, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless to pale greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous to greasy
Habit: Crystals rounded and pitted, rare; massive; compact, granular
Hardness: 6
Specific gravity: 3.15
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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