Formula: MgFe(SO4)2(OH) . 7H2O
Origin of name: From Greek for bunch or grapes, and to bear
Crystal system: Monoclinic
Crystal class: 2/m
Colour: Red to orange
Diaphaneity: Transparent to translucent
Habit: Crystals short to long prismatic; botryoidal or reniform masses
Hardness: 2 to 2.5
Specific gravity: 2.14
Cleavage: 2; {010} perfect, {110} good
Streak: Pale yellowish
Synonyms/varieties:
Comments:
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