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Pyrochlore Group

Mineral Data
A2Nb2(O,OH)6Z
Strunz: 
4
Physical Properties
Colour: 
Brown, yellow-brown, reddish brown, orange, black
Crystal System: 
Isometric
Streak: 
Light brown, yellow-brown
Hardness: 
5 - 5.5
Tenacity: 
Brittle
Synonyms
Synonyms: 
Azor-Phyrrite, Azor-pyrrhite, Azorpyrrhite, Columbomicrolite (of De Villiers), Endeiolite, Fluochlor, Hydrochlor, Koppite, Niobpyrochlor and Pyrochlor