[ Top ] [ Japanese ]

Autunite (Photo)

Year of discovery: 1854 (Saint Symphorien de Marmagne, France), 1930 (Japan)

Locality list: 98 localities of autunite

• Ca(UO₂)₂(PO₄)₂,11H₂O
• Ca(UO₂)₂(PO₄)₂,10-12H₂O
• [Ca²⁺][(UO₂)²⁺₂][(PO₄)₂]^6-,11H₂O

• Class: Autunite group
• Class: Uranyl - Phosphate - Hydrate
• Soluble in: HCl
• Fluorescence: UV excitation (Yellowish green)
• Radioactive: Very strong
• Dehydrate in the air to Meta-autunite.
• Alter to Phosphuranylite.

• Ca => Cu: Torbernite
• Ca => Mn: Fritzscheite
• Ca => Mg: Saléeite (Saleeite)
• Ca => Ba: Uranocircite

• PO₄ => AsO₄: Uranospinite

• 11H₂O => 6H₂O: Meta-autunite

• Color: Yellow
• Streak: Pale yellow
• Luster: Resinous
• Diaphaneity: Transparent-Translucent

• Habit: Thin platy

• Cleavage: Perfect on {001} (1 plane), Indistinct on {100} (1 plane)
• Hardness: 2-2.5
• Density: 3.1

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=14.0, b=20.7, c=7.0

Etymology: Autun district, France