Which is the stable form of silica below 870°C ?
Correct answer: D. Quartz
- A. Tridymite
- B. Cristobalite
- C. None of these
- D. Quartz
Explanation
Quartz is the stable silica modification at lower temperatures, up to about 870°C under the simplified refractory classification used here. Tridymite is stable at intermediate temperatures and cristobalite at still higher temperatures.
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