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Holtite

Type Locality
Greenbushes Sn placers, Greenbushes Tinfield, Bridgetown-Greenbushes Shire, Western Australia, Australia
Mineral Data
(Ta0.60.4)Al6BSi3O18(O,OH)2.25
Strunz: 
9.AJ.10
Physical Properties
Hardness: 
8.5