Formula: (Mg,Cu)Al(SO4)2Cl . 14H2O
Origin of name: From magnesium and aubertite
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 6.31, b = 13.2, c = 6.29, α = 91.7°, β = 94.5°, γ = 82.6°
Colour: Sky-blue
Diaphaneity: Transparent
Luster: Vitreous
Habit: Xenomorphic granular single crystals several hundred µm across in polycrystalline aggregates to 2 cm
Hardness: 2 to 3
Specific gravity: 1.8
Cleavage: 1; {010} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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