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Natrojarosite

Year of discovery: 1902 (Soda Springs Valley, USA), 1968 (Japan)

Locality list: 10 localities of natrojarosite

• NaFe₃(SO₄)₂(OH)₆
• [Na⁺][Fe³⁺₃][(OH)₆|(SO₄)₂]^10-

• Class: Alunite group < Alunite supergroup
• Class: Sulfate - Hydroxide
• Soluble in: HCl (Slowly)

• Na => K: Jarosite
• Na => Ag: Argentojarosite
• Na => NH₃: Ammoniojarosite
• Na => H₃O: Hydroniumjarosite
• Na => Pb: Plumbojarosite
• Na => Tl: Dorallcharite

• Fe => Al: Natroalunite

• Color: Yellow, Brown
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Granular, Thin platy

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3.5
• Density: 3.2

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=7.3, c=16.7