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Thortveitite

Type Locality
Ljoslandsknipan (Thortveitittgruva), Knipan (Knipane), Ljosland, Iveland, Aust-Agder, Norway
Mineral Data
(Sc,Y)2Si2O7
Strunz: 
9.BC.05
Physical Properties
Crystal System: 
Monoclinic
Streak: 
white
Hardness: 
6.0 - 7.0