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Metavoltine

Year of discovery: 1883 (Zagh mine, Iran), 1991 (Japan)

Locality list: 2 localities of metavoltine

• K₂Na₆Fe₇O₂(SO₄)₁₂,18H₂O
• K₂Na₆(Fe,Zn)Fe₆O₂(SO₄)₁₂,18H₂O
• [K⁺₂][Na⁺₆][Fe²⁺][Fe³⁺₆][(SO₄)₁₂|O₂]^28-,18H₂O

• Class: Oxide - Sulfate - Hydrate
• Soluble in: Water (Partly), HCl (Slowly decompose), HNO₃ (Slowly decompose), H₂SO₄ (Slowly decompose)
• Radioactive: Very weak

• Color: Yellow, Yellowish brown
• Streak: Yellowish brown
• Luster: Resinous
• Diaphaneity: Translucent

• Habit: Scaly

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

• System: Trigonal
• Group: (-3), P(-3)
• Lattice: a=9.6, c=18.2

Etymology: Meta- (with) in Greek