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Brannerite

Type Locality
Kelley Gulch, Stanley, Stanley Basin District, Custer Co., Idaho, USA
Mineral Data
(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
Strunz: 
4.DH.05
Physical Properties
Crystal System: 
Monoclinic - Prismatic
Hardness: 
4.5 - 5.5