Formula: (Mg,Fe)2SiO4
Origin of name: for A. Ringwood, Australian geologist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: purple, bluish gray
Diaphaneity:
Luster:
Habit: rounded grains to 10 micron
Hardness:
Specific gravity: 3.90
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: trimorphous with forsterite and wadsleyite, spinel structure type, from a meteorite
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