The high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3Al2O32SiO2) and vitreous silica (SiO2)
- 1 June 1978
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 42 (322) , 195-198
- https://doi.org/10.1180/minmag.1978.042.322.05
Abstract
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 thea- andb-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 crystallographicc-axis, are preserved during phase transformation.Keywords
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