sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 Mohs; Color: Tan/Grey; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline in this form); Cleavage: None; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Tan/Grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 Mohs; Color: Tan/Grey; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline in this form); Cleavage: None; Specific Gravity: 2.65
Formation & geological history
Formed from the erosion of quartz-rich igneous or metamorphic rocks, followed by transport and rounding in a fluvial (river) or coastal environment. These are common in quaternary deposits.
Uses & applications
Commonly used as aggregate in construction, decorative gravel in landscaping, and as a source for silica in industrial glass manufacturing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These small rounded stones are often called 'river rocks' due to the hydraulic action that smooths them.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Look for smooth, rounded shapes in stream beds, beaches, or glacial till deposits.
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