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Rossmanite

Type Locality
Rožná pegmatite (Rozna; Roschna), Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic
Mineral Data
☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Physical Properties
Crystal System: 
Trigonal
Streak: 
White.
Hardness: 
7.0