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

January 1, 1987

Tourmaline (dravite) from a layered two-plagioclase anorthosite in the Boehls Butte quadrangle, Idaho, has the following structural formula: (Na_0.55Ca_0.17)_0.72(Mg_1.96Fe_0.57Mn_0.01Ti_0.04V_0.03Al_0.47)_3.08Al₆(BO₃)_3.02Si_5.98O₁₈(OH,F)_3.35. The indices of refraction are ω = 1.647(1) and ε = 1.621(1), and the unit cell parameters are a = 15.9425(6) and c = 7.1883(3).

Publication Year	1987
Title	Tourmaline (dravite) from the Boehls Butte anorthosite, Idaho, U.S.A.
DOI	10.17741/bgsf/59.2.002
Authors	Anna Hietanen
Publication Type	Article
Publication Subtype	Journal Article
Series Title	Geological Society of Finland, Bulletin
Index ID	70014770
Record Source	USGS Publications Warehouse

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

U.S. Geological Survey

U.S. Department of the Interior

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

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