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Simpsonite

Type Locality
Tabba Tabba pegmatite, Wallareenya Station, Port Hedland Shire, Western Australia, Australia
Mineral Data
Al4(Ta,Nb)3O13(OH,F)
Strunz: 
4.DC.10
Physical Properties
Crystal System: 
Hexagonal
Streak: 
white
Hardness: 
7.0 - 7.5
Tenacity: 
brittle