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Metauranocircite

Year of discovery: 1904 (Krunkelbach Valley deposit, Germany), 1969 (Japan)

Locality list: 4 localities of metauranocircite

• Ba(UO₂)₂(PO₄)₂,7H₂O
• Ba(UO₂)₂(PO₄)₂,6-8H₂O
• [Ba²⁺][(UO₂)²⁺₂][(PO₄)₂]^6-,7H₂O

• Class: Autunite group
• Class: Uranyl - Phosphate - Hydrate
• Fluorescence: UV excitation (Yellowish green)
• Radioactive: Very strong
• Formed on dehydration of Uranocircite

• Ba => Cu: Metatorbernite
• Ba => Ca: Meta-autunite

• 7H₂O => 10H₂O: Uranocircite

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

• Hardness: 2-2.5
• Density: 3.9

• System: Monoclinic
• Group: 2, P2₁
• Lattice: a=6.9, b=17.6, c=7.0, β=90.0

Etymology: Meta- (with) in Greek