Formula: CuFe(SO4)2(OH) . 4H2O
Origin of name: For Frank Guild, American mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Honey yellow to deep chestnut brown
Diaphaneity: Translucent
Luster: Vitreous
Habit: Crystals short prismatic, pseudocubic
Hardness: 2.5
Specific gravity: 2.69
Cleavage: 2; {001} and {100} perfect
Tenacity:
Streak: Pale canary yellow
Synonyms/varieties:
Comments:
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