Mrs.gregory found a mineral that scratched glass and was scratched by topaz
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Quartz
Quartz is a 7. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). It can be scratched by topaz, corundum, and diamond. Quartz is the second most abundant mineral found in Earth's continental crust, it's behind feldspar. Quartz can be found in two forms, the normal one is α-quartz, and the other one is high-temperature β-quartz, both of which are chiral.
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