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Argentojarosite

Year of discovery: 1923 (Tintic Standard mine, USA), 1976 (Japan)

Locality list: A locality of argentojarosite

• AgFe³⁺₃(SO₄)₂(OH)₆
• [Ag⁺][Fe³⁺₃][(OH)₆|(SO₄)₂]^10-

• Class: Alunite group < Alunite supergroup
• Class: Sulfate - Hydroxide

• Ag => K: Jarosite
• Ag => Na: Natrojarosite
• Ag => NH₄: Ammoniojarosite
• Ag => H₃O: Hydroniumjarosite
• Ag => Pb_0.5: Plumbojarosite
• Ag => Tl: Dorallcharite

• Color: Yellowish brown
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Granular, Platy

• Cleavage: Distinct on {0001} (1 plane)
• Hardness: 3.5-4.5
• Density: 3.7

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=7.4, c=16.6