Quartz
mineral · common
Quick facts
- Formula
- SiO2
- Hardness
- 7
- Luster
- Vitreous
- Colors
- Colorless, white, pink, purple, smoky
The most common mineral on Earth's continental crust. Hard, glassy, and usually hexagonal.
Cannot be scratched by steel. No cleavage; conchoidal fracture. Distinguish from calcite with a hardness or acid test.
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