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| Q. |
Quartz is a crystalline form of - |
| A. | Alumina |
| B. | Glass |
| C. | Silica |
| D. | Limestone |
| Answer» C. Silica | |
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Explanation: Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite and cristobalite are hightemperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks. |
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