sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: light brown, tan, or grey due to surface staining; Luster: vitreous to dull; Crystal structure: trigonal; Cleavage: none; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- light brown, tan, or grey due to surface staining
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: light brown, tan, or grey due to surface staining; Luster: vitreous to dull; Crystal structure: trigonal; Cleavage: none; Specific gravity: 2.65
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks like granite or pegmatite, followed by transportation via water and deposition in sedimentary environments, lasting over millions of years
Uses & applications
Used in landscaping, aggregate for construction, abrasive materials, and glassmaking
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which allows small pebbles to survive transport over vast distances
Field identification & locations
Can be identified in the field by its high hardness (scratches glass) and conchoidal fracture. Common in riverbeds, beaches, and alluvial deposits worldwide
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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