Formula: KFe3(SO4)2(OH)6
Origin of name: After locality; Baranco Jaroso, Sierra Almagrera, Spain
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 7.29 Ǻ, c = 17.16 Ǻ
Colour: Pale yellow to yellowish brown to brown
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals tabular or pseudocubic, microscopic to minute as crusts and coatings; massive, granular; fibrous; earthy
Hardness: 2.5 to 3.5
Specific gravity: 2.9 to 3.26
Cleavage: 1; {0001} distinct
Tenacity: Conchoidal to uneven; brittle
Streak: Pale yellow
Synonyms/varieties: Autunezite, moronolite, selenjarosite (Se-rich var.)
Comments:
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