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Changes in crystal morphology of synthetic reedmergnerite (NaBSi3O8) during ordering experiments

Published online by Cambridge University Press:  05 July 2018

R. A. Mason*
Affiliation:
Dept. of Geology, The University, Manchester M13 9PL, Great Britain
*
* Present address:, The University of Chicago, Dept. of the Geophysical Sciences, 5734 S. Ellis Avenue, Chicago Illinois 60637, USA

Summary

The morphologies of hydrothermally grown reedmergnerite crystals change systematically with time and rate of change of B, Si order. Three stages in this process are recognized: (1) Growth of well-faceted crystals. (2) Development of etching leading to the formation of irregular grains. (3) Modification of irregular grains to form rounded or ellipsoidal crystals. A solutionreprecipitation process is responsible for the morphological changes and the increase in degree of order of B and Si with time at constant temperature and pressure.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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