Quartz
SiO2
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Quartz is the second most abundant mineral in Earth's continental crust, after feldspar. It occurs in virtually every geological environment and is a component of almost every rock type. Varieties include amethyst, citrine, rose quartz, smoky quartz, and chalcedony.
| Crystal System | Trigonal |
| Mineral Class | 09 Silicates |
| Mohs Hardness | 7.0 |
| Specific Gravity | 2.65 |
| Color | Colorless, white, purple, pink, brown, black |
| Luster | Vitreous |
| Streak | White |
| Cleavage | None |
| Fracture | Conchoidal |
| Transparency | Transparent |
| Crystal Habit | Prismatic, massive, druzy |
Mohs Hardness
Mohs Hardness: 7.0 – 7.0
1 Soft10 Hard
Crystal System
TrigonalExplore on Science FYI
Frequently Asked Questions
What is the hardness of Quartz?
Quartz has a Mohs hardness of 7.0.
What crystal system does Quartz belong to?
Quartz crystallizes in the Trigonal crystal system.
What color is Quartz?
Quartz is typically Colorless, white, purple, pink, brown, black.
What type of luster does Quartz have?
Quartz exhibits a Vitreous luster.
What is the chemical formula of Quartz?
The chemical formula of Quartz is SiO2.