Crystal & mineral guide
Clear Quartz
SiO₂
The archetypal crystal — piezoelectric workhorse of industry and field ID baseline.
Identify Clear Quartz with RockScanAbout Clear Quartz
Rock crystal quartz grows hexagonal prisms with pyramid tips. It defines Mohs hardness 7 and is a baseline for identifying other stones. Varieties (amethyst, citrine, smoky, rose) share the same chemistry with different color causes.
Clear Quartz belongs in a crystal identifier workflow because photo cues — color zoning, crystal habit, and surface luster — combine with measurable traits like Mohs 7 and specific gravity 2.65. Use RockScan’s camera to get a first-pass ID, then confirm with the checklist below.
Clear Quartz properties
| Mohs hardness | 7 |
|---|---|
| Crystal system | Trigonal |
| Luster | Vitreous |
| Color | Colorless |
| Composition | Silicon dioxide |
| Formation | Hydrothermal veins, pegmatites, geodes |
| Occurrence | Worldwide |
| Specific gravity | 2.65 |
| Cleavage | None |
How to identify Clear Quartz
- Hexagonal prism + pyramid termination
- Hardness 7; conchoidal fracture
- RI ~1.54–1.55
Collector notes
- Quartz watches use piezoelectric oscillation
- Second most abundant mineral in Earth's crust
Value context: Optical-grade clear points and phantoms attract collectors.
Clear Quartz FAQ
How do you identify Clear Quartz?
Clear Quartz (SiO₂) is typically recognized by colorless color, vitreous luster, Mohs hardness 7, and trigonal crystal system. RockScan can suggest Clear Quartz from a photo and surface these checks on the result card.
What is Clear Quartz made of?
Clear Quartz composition: Silicon dioxide. It forms via hydrothermal veins, pegmatites, geodes and is found in Worldwide.
Is Clear Quartz valuable?
Optical-grade clear points and phantoms attract collectors.
