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Grayite

Year of discovery: 1957 (Gooddays mine, Zimbabwe), 1994 (Japan)

Locality list: 2 localities of grayite

• (Th,Pb,Ca)PO₄,H₂O
• [(Th⁴⁺,Pb²⁺,Ca²⁺)][PO₄]^3-,H₂O

• Class: Rhabdophane group
• Class: Phosphate - Hydrate
• Fluorescence: UV excitation (Some localities, Yellow)
• Radioactive: Strong

• Th => Ca: Brockite
• Th => Nd: Rhabdophane-(Nd)
• Th => La: Rhabdophane-(La)
• Th => Ce: Rhabdophane-(Ce)
• Th => Y: Rhabdophane-(Y)

• Color: Dark reddish brown
• Luster: Resinous
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 3-4
• Density: 4.0

• System: Hexagonal
• Group: 622, P6₂22
• Lattice: a=7.0, c=6.4