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Thortveitite and associated Sc-bearing minerals from Ravalli County, Montana

Canadian Mineralogist

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Abstract

The rare Sc mineral thortveitite, (Sc,Y)2Si2O7, occurs as ??m- to mm-sized crystals in fluorite-bearing granitic pegmatites and the host melagabbro within the Crystal Mountain fluorite deposit, Ravalli County, Montana. Thortveitite is found as colorless and clear to smoky and translucent, subhedral to euhedral prisms up to 3 mm in length in the massive fluroite, as mm-sized anhedra to subhedra in diopside and edenite, and as ??m-sized droplet-like crystals in actinolite. Micrometric textures suggest that some thortveitite exsolved from actinolite, which contains between 1.2 and 2.9 wt.% Sc2O3. The source of the Sc is believed to be magmatic. The physical, optical and crystallographic properties of thortveitite are described. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Thortveitite and associated Sc-bearing minerals from Ravalli County, Montana
Series title:
Canadian Mineralogist
Volume
31
Issue:
2
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
337
Last page:
346
Number of Pages:
10