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Voltaite

Year of discovery: 1841 (Solfatara di Pozzuoli, Italy), 1958 (Japan)

Locality list: 5 localities of voltaite

• K₂Fe₈Al(SO₄)₁₂,18H₂O
• [K⁺₂][Fe²⁺₅][Fe³⁺₃][Al³⁺][(SO₄)₁₂]^24-,18H₂O

• Class: Voltaite group
• Class: Sulfate - Hydrate
• Soluble in: Water, HCl, HNO₃, H₂SO₄
• Radioactive: Very weak

• Fe²⁺ => Mg: Pertlikite
• Fe²⁺ => Zn: Zincovoltaite

• Color: Green, Greenish black
• Streak: Greenish gray
• Luster: Resinous
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 3-3.5
• Density: 2.6

• System: Cubic
• Group: m3m, Fd3c
• Lattice: a=27.3