mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal trapezoidal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to milky
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal trapezoidal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Commonly forms in hydrothermal veins or as a secondary mineral in igneous, metamorphic, and sedimentary rocks. This specific specimen appears to be a water-worn or weathered pebble fragment.
Uses & applications
Used widely in glass making, electronics (piezoelectric properties), abrasives, and as semi-precious gemstones in jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as small pebbles in sand and soil.
Field identification & locations
Identify by its hardness (it can scratch glass and steel) and lack of cleavage. Found globally in riverbeds, beaches, and soil. For collectors, look for clarity and crystal terminations.
