Formula: Ag Fe3 (SO4)2 (OH)6
Origin of name: From silver (Latin argentum) and jarosite
Crystal system: Hexagonal
Crystal class: -3 2/m
Unit cell: a = 7.35 Ǻ, c = 16.58 Å
Colour: Yellow to brown
Diaphaneity: Transparent to translucent
Luster: Brilliant
Habit: Crystals microscopic; micaceous; flattened with hexagonal outline; fine-grained masses and coatings
Hardness: 3.5-4.5
Specific gravity: 3.62 to 3.66
Cleavage: 1; {0001}
Streak: Yellow
Synonyms/varieties:
Comments:
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