mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to tan/cream with iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to tan/cream with iron oxide staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to tan/cream with iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes in veins or as a primary mineral in igneous rocks. This specimen is well-rounded, indicating it has been smoothed by water erosion in a river or beach environment over thousands of years.
Uses & applications
Commonly used as decorative landscaping stone, in construction aggregates, or as tumbled pocket stones for collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is colorless, but impurities like iron can create the tan or yellow staining seen on this pebble's surface.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of cleavage. It is found globally in riverbeds, beaches, and glacial deposits.
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Mineral
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Mineral/Rock
Granite
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