Formula: KFe(SO4)2
Origin of name: for the Yavapai Indians, Jerome, Arizona where the mineral was found.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.152, b = 5.153, c = 7.877, β = 94.9°
Colour: Pale pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals short and stubby, up to 0.6 mm, acicular
Hardness: 2.5 to 3
Specific gravity: 2.88
Cleavage: 3; {001}and {100} perfect, {110} distinct
Tenacity: Conchoidal fracture
Streak: White to yellow white
Synonyms/varieties:
Comments:
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