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Hydroxycalciopyrochlore

Year of discovery: 2011 (Maoniuping mine, China), 2024 (Japan)

Locality list: A locality of hydroxycalciopyrochlore

• Ca₂Nb₂O₆OH
• (Ca,Na,U,[])₂(Nb,Ti)₂O₆OH
• [Ca²⁺₂][OH|(NbO₃)₂]^2-

• Class: Pyrochlore group < Pyrochlore supergroup
• Class: Niobate - Hydroxide
• Soluble in: Phosphoric acid (H₃PO₄)
• Insoluble in: HCl, HNO₃

• Ca => ([],Ce,Ba): Hydroxykenopyrochlore
• Ca => Mn: Hydroxymanganopyrochlore
• Ca => (Na,Ca,Ce): Hydroxynatropyrochlore
• Ca => Pb: Hydroxyplumbopyrochlore

• OH => O: Oxycalciopyrochlore
• OH => F: Fluorcalciopyrochlore

• Color: Dark brown, Greenish brown, Black
• Streak: Brown
• Luster: Greasy
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 5 - 6

• System: Cubic
• Group: m3m, Fd(-3)m
• Lattice: a=10.4