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Oxycalciopyrochlore

Year of discovery: 2012 (Japan)

Locality list: 2 localities of oxycalciopyrochlore

• Ca₂Nb₂O₇
• [Ca²⁺₂][O|(NbO₃)₂]^2-

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

• Ca => Na: Oxynatropyrochlore
• Ca => Pb: Oxyplumbopyrochlore
• Ca => Y: Oxyyttropyrochlore-(Y)

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

• Color: Dark brown-Black
• Streak: Brown
• Luster: Adamandine
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 5.5

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=10.4