Formula: (Mg,Cu)2(CO3)(OH)2
Origin of name: For Albert McGuiness, American mineral dealer
Crystal system: Monoclinic or triclinic
Crystal class: Unknown
Twinning:
Unit cell: a = 9.40 Å, b = 12.01 Å, c = 3.38 Å, β = 93.3°
Colour: Greenish blue
Diaphaneity:
Luster: Vitreous to silky
Habit: Spherules 0.1 - 2 mm
Hardness: 2.5
Specific gravity: 3.02 to 3.22
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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