mineral
Quartz pebble
Silicon dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Yellowish to white. Luster: Vitreous to greasy. Crystal system: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Yellowish to white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Yellowish to white. Luster: Vitreous to greasy. Crystal system: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.
Formation & geological history
Formed through the weathering and erosion of parent rocks containing quartz veins or pegmatites. The sharp edges are worn down over long distances through water transport in rivers or ocean waves, resulting in a smooth, rounded pebble.
Uses & applications
Used in landscaping, decorative stone, filtration systems, and as a raw material for silicon and glass production. Common in amateur rock tumbling and lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's crust. Its high resistance to both mechanical weathering and chemical decomposition allows it to survive long transport journeys where other minerals break down.
Field identification & locations
Found worldwide in riverbeds, beaches, and alluvial deposits. Can be identified by its high hardness (scratches glass easily) and lack of cleavage.
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