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Phosphuranylite

Year of discovery: 1879 (Buchanan mine, USA), 1959 (Japan)

Locality list: 7 localities of phosphuranylite

• (H₃O)₃KCa(UO₂)₇(PO₄)₄O₄,8H₂O
• [(H₃O)⁺₃][K⁺][Ca²⁺][(UO₂)²⁺₇][O₄|(PO₄)₄]^20-,7H₂O

• Class: Oxonium - Uranyl - Phosphate - Oxide - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Fluorescence: UV excitation (Orange)
• Radioactive: Very strong
• Formed by alteration of Autunite.

• Color: Yellow, Dark yellow
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 plane), Indistinct on {010} (1 plane)
• Hardness: 2.5
• Density: 4.1

• System: Orthorhombic
• Group: mmm, Cmcm
• Lattice: a=15.8, b=13.7, c=17.3