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Aphthitalite

Year of discovery: 1813 (Monte Vesuvius, Italy), 1963 (Japan)

Locality list: 2 localities of aphthitalite

• K₃Na(SO₄)₂
• (K,Na)₃Na(SO₄)₂
• [K⁺₃][Na⁺][(SO4)2]^4-

• Class: Sulfate
• Soluble in: Water, HCl, HNO₃, H₂SO₄
• Fluorescence: UV excitation (Yellow)
• Radioactive: Very weak

• Color: White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Cleavage: Good on {1011} (3 planes), Indistinct on {0001} (1 plane)
• Hardness: 3
• Density: 2.7

• System: Trigonal
• Group: (-3)m, P(-3)m
• Lattice: a=5.7, c=7.3