Quartz is___________________?
Correct answer: D. All A., B. and C.
- A. Stable form of silica upto 870°C
- B. Converted to Tridymite on firing between 870 to 1470°C
- C. Transformed to Cristobalite on heating above 1470°C
- D. All A., B. and C.
Explanation
Silica changes progressively from quartz to tridymite between about 870 and 1470°C, and to cristobalite above about 1470°C. Thus all three statements describe its high-temperature transformations.
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