Formula: MgO
Origin of name: from Greek for around and fracture
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: colourless, white, gray, yellow, brownish yellow, green, black
Diaphaneity: transparent
Luster: vitreous
Habit: crystals octahedral, cubic, cubo-octahedral, dodecahedral, rounded grains
Hardness: 5.5
Specific gravity: 3.56
Cleavage: 2; {001} perfect, {111} imperfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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