NDLI: Boralsilite (Al 16 B 6 Si 2 O 37 ); a new mineral related to sillimanite from pegmatites in granulite-facies rocks

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Boralsilite (Al 16 B 6 Si 2 O 37 ); a new mineral related to sillimanite from pegmatites in granulite-facies rocks

Content Provider	Semantic Scholar
Author	Grew, Edward S. Mcgee, James J. Yates, Martin G. Peacor, Donald R. Rouse, Roland C. Huijsmanns, Joep P. P. Shearer, Charles K. Wiedenbeck, Michael Thost, Douglas E. Su, Shu-Chun
Copyright Year	1998
Abstract	Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in pegmatites cutting granulite-facies metapelitic rocks at Larsemann Hills, Prydz Bay, east Antarctica (type locality) and Almgjotheii in the contact aureole of the Rogaland Intrusive Complex, southwestern Norway. Stable assemblages include: (1) quartz-potassium feldspar-boralsilite-schorl/dravite (Larsemann Hills); (2) potassium feldspar-plagioclase (An 22 )-boralsilite-werdingite-dumortierite -grandidierite (Almgjotheii); (3) quartz-potassium feldspar-boralsilite-dumortierite-andalusite+ or -sillimanite (Almgjotheii). Boralsilite is estimated to have formed between 600 and 750 degrees C and 3-5 kbar at conditions where P H2O nu extremely weak, and gamma b. It is monoclinic, space group C2/m with lattice parameters for Larsemann Hills of a = 14.767(1), b= 5.574(1), c = 15.079 (1) Aa, beta = 91.96(1) degrees , V = 1240.4 (2) Aa 3 , Z = 2, and D calc = 3.07 g/cm 3 .
Starting Page	638
Ending Page	651
Page Count	14
File Format	PDF HTM / HTML
DOI	10.2138/am-1998-5-624
Volume Number	83
Alternate Webpage(s)	http://www.minsocam.org/MSA/AmMin/TOC/Abstracts/1998_Abstracts/MJ98_Abstracts/Grew_p638_98.pdf
Alternate Webpage(s)	https://doi.org/10.2138/am-1998-5-624
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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