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Brockite

Year of discovery: 1962 (Bassick mine area, USA), 1949 (Japan as Nogisawaite)

Locality list: 9 localities of brockite

• CaPO₄,H₂O
• [(Ca²⁺,Th⁴⁺,Ce³⁺)][PO₄]^3-,H₂O

• Class: Rhabdophane group
• Class: Phosphate - Hydrate
• Radioactive: Strong

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

• H₂O => 2H₂O: Tristramite

• Color: Reddish brown, Yellow
• Streak: Pale yellow
• Luster: Resinous
• Diaphaneity: Translucent, Opaque

• Cleavage: No
• Hardness: 3-4
• Density: 3.9

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