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CHANGES IN THE CONSTITUTION AND MICROSTRUCTURE OF ANDALUSITE, CYANITE, AND SILLIMANITE AT HIGH TEMPERATURES AND THEIR SIGNIFICANCE IN INDUSTRIAL PRACTICE *
Author(s) -
Peck Albert B.
Publication year - 1925
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1925.tb16749.x
Subject(s) - andalusite , sillimanite , mullite , petrography , mineralogy , geology , recrystallization (geology) , materials science , geochemistry , metallurgy , ceramic , metamorphic rock , quartz , petrology , biotite
Owing to their growing commercial importance in the manufacture of refractories and porcelain, the minerals of the sillimanite group (andalusite, cyanite, and sillimanite) were investigated as to their decomposition products and volume changes between cones 10 and 15. Petrographic‐microscopic examinations showed that andalusite breaks down at cone 13 into mullite and glass, while cyanite also breaks down into the same components but at cone 12. Sillimanite is not decomposed up to cone 15. The composition of the mullite was checked by chemical analysis. Andalusite shows almost no volume change at dissociation; sillimanite shows a slight expansion up to cone 15; cyanite shows a great expansion and disintegration at dissociation. The practical significance of the behavior of the minerals is discussed as well as their possibilities of use in ceramic ware., Andalusite could be used in the raw state; cyanite would require calcination before use, so that andalusite appears to be best suited for most bodies.