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Metatorbernite

Year of discovery: 1916 (Schneeberg District, Germany, and Redruth, UK), 1938 (Japan)

Locality list: 7 localities of metatorbernite

• Cu(UO₂)₂(PO₄)₂,8H₂O
• [Cu²⁺][(UO₂)²⁺₂][(PO₄)₂]^6-,8H₂O

• Class: Autunite group
• Class: Uranyl - Phosphate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Radioactive: Very strong
• Formed on dehydration of Torbernite
• Formed above 75 degree.

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

• PO₄ => AsO₄: Metazeunerite (Series)

• 8H₂O => 10H₂O: Torbernite (below 75 degree)

• Color: Pale green, Dark green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {001} (1 plane), Indistinc on {010} (010)
• Hardness: 2.5
• Density: 3.8

• System: Tetragonal
• Group: 4/m, P4/n
• Lattice: a=7.0, c=17.3

Etymology: Meta- (with) in Greek