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The high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3Al2O32SiO2) and vitreous silica (SiO2)

Published online by Cambridge University Press:  05 July 2018

Wolfgang Pannhorst  and
Hartmut Schneider
Wolfgang Pannhorst
Affiliation:
Kristallographisches Institut der Universität
Hartmut Schneider
Affiliation:
Kristallographisches Institut der Universität
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Summary

The high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3A2O32SiO2) plus vitreous silica (SiO2) has been studied within the temperature interval from 1300 to 1600 °C by means of X-ray powder and single-crystal techniques and by infrared spectroscopy. Results are interpreted in terms of a topotactic transformation in which (011) and (01) planes of andalusite transform into (20) and (201) planes of 3/2-mullite; in this way the a- and b-axes of the two phases are interchanged. From the structural and orientational relationship between the andalusite and 3/2-mullite latrices it is concluded that the aluminium-oxygen octahedral chains, running in both structures parallel to the crystallographic c-axis, are preserved during phase transformation.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 322 , June 1978 , pp. 195 - 198
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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Footnotes

*

Present address: Forschungsinstitut der Feuerfest-industrie, An der Elisabethkirche 27, 5300 Bonn, Germany.

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