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Jarosite (Photo) [abbr. Jrs ]

Year of discovery: 1852 (Jaroso Ravine, Spain), 1920 (Japan)

Locality list: 134 localities of jarosite

• KFe₃(SO₄)₂(OH)₆
• [K⁺][Fe³⁺₃][(OH)₆|(SO₄)₂]^10-

• Class: Alunite group < Alunite supergroup
• Class: Sulfate - Hydroxide
• Soluble in: HCl
• Insoluble in: Water
• Electrical: Pyroelectric (Strong)
• Radioactive: Very weak

• K => Na: Natrojarosite (Series,Discontinuous under low temperature)
• K => Ag: Argentojarosite
• K => NH₃: Ammoniojarosite
• K => H₃O: Hydroniumjarosite
• K => Pb: Plumbojarosite
• K => Tl: Dorallcharite

• Fe => Al: Alunite

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

• Habit: Granular, Thin platy

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3.5
• Density: 3.1

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.3, c=17.3