Abstract

In a detailed investigation of the system Al203-SiO2-H20, Roy and Osborn (1952) reported their failure to synthesize consistently and unequivocally the anhydrous aluminosilicates, sillimanite, andalusite and kyanite. Several earlier workers have reported the synthesis of sillimanite (Balconi 1941, Michel-Levy, 1949, Morey, 1942) but positive evidence that the product was sillimanite and not mullite has been lacking. Reports of the synthesis of andalusite (see Doelter, 1917, Baur, 1911, Lacy, 1952) are similarly open to question in view of the absence of evidence for positive identification of andalusite as a product of the reaction.

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