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Tourmaline (dravite) from the Boehls Butte anorthosite, Idaho, U.S.A.

Geological Society of Finland, Bulletin

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Abstract

Greenish black tourmaline occurs in small localized masses in the Boehls Butte layered, two-plagioclase anorthosite. Chemical analysis by S. Neil gave SiO2 36.6, TiO2 0.34, B2O3 10.7, Al2O3 33.6, V2O3 0.24, FeO 4.16, MnO 0.09, MgO 8.04, CaO 0.98, Na2O 1.74, F 0.03, H2O+ 3.06, less O = F 0.01, = 99.57; epsilon (pale reddish brown) 1.62, omega (brownish green) 1.647; a 15.9425, c 7.1883 A.-R.A.H.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tourmaline (dravite) from the Boehls Butte anorthosite, Idaho, U.S.A.
Series title:
Geological Society of Finland, Bulletin
Volume
59
Issue:
2
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Society of Finland, Bulletin
First page:
91
Last page:
95
Number of Pages:
5