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SILLIMANITE 1 DEVELOPMENT IN SOME TYPICAL CLAYS 2
Author(s) -
Kraner Hobart M.
Publication year - 1924
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.1151-2916.1924.tb18159.x
Subject(s) - sillimanite , refraction , mineralogy , amorphous solid , dehydration , geology , crystallography , chemistry , optics , physics , paleontology , biochemistry , quartz , biotite
The question of sillimanite development in clays during firing is given theoretical consideration. References are cited which indicate a change in the structure of the clay molecule immediately after dehydration. Since most materials in the amorphous condition have lower indices of refraction than crystals or crystalline aggregates of the same chemical composition, the development of sillimanite is traced by increase of the mean indices of refraction of the fired clay aggregates. Results based upon this method show a rapid development of sillimanite between 900 and 1100°C.