Discussion
The three polymorphs of silica encountered in ceramics are
Answer: A
Correct answer: quartz, tridymite and cristobalite
These are the three crystalline forms of silica stable over successive temperature ranges, with quartz lowest and cristobalite highest. Each has its own low and high temperature variant, and it is the alpha to beta quartz inversion at 573 degrees that governs firing schedules. The other options are the clay minerals, the alumina and aluminosilicate phases, and the carbonates.
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