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Differentiating veatchite polytypes using X-ray powder diffraction

Published online by Cambridge University Press:  15 October 2013

Ralph Rowe ,
Joel D. Grice  and
Rémy S. Poulin
Ralph Rowe*
Affiliation:
Research Division, Canadian Museum of Nature, P.O. Box 3443, Stn. D, Ottawa, Ontario K2P 6P4, Canada
Joel D. Grice
Affiliation:
Research Division, Canadian Museum of Nature, P.O. Box 3443, Stn. D, Ottawa, Ontario K2P 6P4, Canada
Rémy S. Poulin
Affiliation:
Earth Sciences Department, Laurentian University, Sudbury Campus, 935 Ramsey Lake Road, Sudbury, Ontario, P3E 2C6, Canada
*
a)Author to whom correspondence should be addressed. Electronic mail: rrowe@mus-nature.ca
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Abstract

Veatchite polytypes were properly identified from several localities relying solely on micro powder diffraction data. Diagnostic differences in their respective calculated patterns gave reliable identification results when compared with measured data. This permitted the confirmation of co-existing veatchite-1A and -2M on the same specimen from the Billie Mine, Inyo County, California as flat elongated crystals (-1A) and flat rhombic plates (-2M), respectively. On the specimen from the Sterling Borax Mine (Lang), type-locality for veatchite-2M, the polytype veatchite-1A was confirmed from radiating rhombic plates. From the type specimen for veatchite-1A (rhombic plates), collected from the borate deposit in Emet, Turkey, an additional unknown polytype of this mineral was discovered, but lacks suitable material for a complete characterization. At the Penobsquis deposit near Sussex in New Brunswick, Canada, only veatchite-2M was encountered. The area between 20 and 25°2θ holds the following diffraction signatures: -1A (two sets of double peaks at approximately 21.5 and 24.5°2θ), -1M (single peaks at 20 and 23°2θ) and -2M (double peaks at 20 and 23°2θ). The unknown polytype from Emet, Turkey differs from polytype-1A in that same range by having single peaks at the 21.5 and 24.5° instead of double peaks.

Keywords

veatchitepolytypeXRDphase identificationprofile fittingmicro-diffractometer
Type
Laboratory Note
Information
Powder Diffraction , Volume 29 , Issue 1 , March 2014 , pp. 69 - 75
Copyright
Copyright © International Centre for Diffraction Data 2013 

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