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Meta-autunite

Year of discovery: 1904 (Daybreak mine, USA), 1957 (Japan)

Locality list: 11 localities of meta-autunite

• Ca(UO₂)₂(PO₄)₂,6H₂O
• Ca(UO₂)₂(PO₄)₂,6-8H₂O
• [Ca²⁺][(UO₂)²⁺₂][(PO₄)₂]^6-,6H₂O

• Class: Autunite group
• Class: Uranyl - Phosphate, Hydrate
• Fluorescence: UV excitation (Yellowish green)
• Radioactive: Very strong
• Formed on dehydration of Autunite in the air.

• Ca => Cu: Metatorbernite
• Ca => Ba: Metauranocircite

• 6H₂O => 11H₂O: Autunite

• Color: Yellowish green, Yellow
• Streak: Pale yellow
• Luster: Waxy
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2-2.5
• Density: 3.4

• System: Tetragonal
• Group: 4/mmm, P4/nmm
• Lattice: a=7.0, c=8.5

Etymology: Meta- (with) in Greek and Autun district, France