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Mineralpedia Details for Thortveitite

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Thortveitite

Thortveitite

Norwegian mineralogist Olaus Thortveit is the namesake of this mineral as he was the one to discover it. Thortveitite is found at quite e few localities including Norway, Japan, Russia, and the USA in granite, pegmatitic dikes.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/thortveitite.pdf

Formula
Sc2Si2O7 
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Fine, Radial, Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Adamantine 
Color
brown, grayish black, black, grayish green 
Streak
gray 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
6.5 
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Thortveitite from Tuftane quarry, Frikstad, Iveland, Aust-Agder, Norway

Thortveitite
            from Tuftane quarry, Frikstad, Iveland, Aust-Agder, Norway

The crystals in this specimen are slender, glassy greenish crystals suspended in Plagioclase matrix.

Click thumbnail images for larger view.

Thortveitite from Flåt Feldspar Quarry, Flåt, Evje og Hornnes, Aust-Agder, Norway

Thortveitite
            from Flåt Feldspar Quarry, Flåt, Evje og Hornnes, Aust-Agder, Norway

Slender greenish Thortveitite crystals to 7-8mm embedded throughout a piece of reddish Feldspar matrix.

Thortveitite is a relatively rare REE Silicate that was discovered in Norway and named for Olaus Thortveit, a feldspar and mineral exporter.

Click thumbnail images for larger view.

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