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Investigation of polytypes in lepidolite using electron back-scattered diffraction
-
Toshihiro Kogure
and
Michiaki Bunno
Published/Copyright:
March 28, 2015
Abstract
In this paper we show that electron back-scattered diffraction (EBSD) is an effective technique for identifying polytypes of micas in a scanning electron microscope (SEM). Platy crystals mounted on a specimen holder are instantly analyzed and the polytypes are determined by comparing observed and calculated Kikuchi patterns. Subfamilies A and B are easily distinguished by trigonal and hexagonal symmetries, respectively, around the [001]* direction of the Kikuchi bands corresponding to family reflections. In subfamily A, 1M and 2M1 polytypes can be identified by means of several intense bands characteristic to each polytype, but 3T and 1Md are probably difficult to distinguish from each other. The EBSD identification has been applied to the investigation of polytype occurrence in lepidolite from a lithium pegmatite. 1M, 2M1, and 2M2 polytypes were unambiguously distinguished. Some crystals contained polytypes of the two subfamilies stacked along the [001]* direction. A combination of X-ray chemical analyses and EBSD in an SEM showed that the chemical compositions of 1M and 2M1 crystals were segmented, whereas those of 2M2 were in the range of both 1M and 2M1 compositions.
Received: 2003-11-24
Accepted: 2004-3-17
Published Online: 2015-3-28
Published in Print: 2004-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Calorimetry of liquids in the system Na2O-Fe2O3-SiO2
- A Mössbauer study of the oxidation state of Fe in silicate melts
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