Formula: Cu2Mg2(Mg,Cu)(AsO4)2(OH)4·4H2O
Origin of name: Named for the locality, El Guanaco Mine, East Catalina, Chile
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.475, b = 16.865, c = 6.915 Å, β = 99.80°
Colour: Blue
Diaphaneity: Transparent
Luster: Vitreous
Habit: Bladed crystals
Hardness:
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Streak:
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