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Quartz is | |
A. | stable form of silica upto 870°C. [Wrong Answer] |
B. | converted to tridymite on firing between 870 to 1470°C. [Wrong Answer] |
C. | transformed to crystoballite on heating above 1470°C. [Wrong Answer] |
D. | all (a), (b) and (c). [Correct Answer] |