sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: whitish with grey and brownish mottling; Luster: vitreous to waxy; Crystal structure: trigonal; Cleavage: none, conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- whitish with grey and brownish mottling
- Luster
- vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: whitish with grey and brownish mottling; Luster: vitreous to waxy; Crystal structure: trigonal; Cleavage: none, conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent igneous, metamorphic, or sedimentary rocks, typically over millions of years in riverbeds, beaches, or alluvial deposits.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and lapidary practice.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving weathering processes that destroy other minerals.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape. Found globally in streams, rivers, and gravel bars.
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