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NaFe3Al6B3Si6O27(OH)4
Hexagonal
Schorl, a sodium iron aluminum boron silicate hydroxide mineral of the tourmaline group, is rare at Sterling Hill and unknown from Franklin. The one occurrence is of a 3 cm radial spray of acicular crystals within feldspar, labeled as being from the open cut near the Noble Pit at Sterling Hill. They were verified by semi-quantitative microprobe analysis yielding SiO2 34, Al2O3 33, FeO 13, MgO 2.8, CaO <1, TiO2 1, MnO <1, Na2O 3 weight percent.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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