Formula : (Sc,Y)2[Si2O_7_]
System: monoclinic Hardness:6-7 Rarity:very rare
Strunz id:VIII/C.1-10 -
SILICATES
Name origin: Named in 1911 by Jakob Grubbe Cock Schetelig in honour of Gunder Olaus Olsen Thortveit (1 October 1872, Thortveit, Iveland, Aust-Agder, Norway - 15 June 1917, Rossås, Iveland, Aust-Agder, Norway), feldspar and mineral exporter from Iveland, Norway.
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