mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Yellowish-brown, tan, and translucent white; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/massive in pebble form); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Yellowish-brown, tan, and translucent white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellowish-brown, tan, and translucent white; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/massive in pebble form); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Formed through crystallisation in igneous, metamorphic, or sedimentary environments. This specific specimen is a stream- or beach-rounded pebble that has undergone natural erosion and transportation by water.
Uses & applications
Commonly collected as river pebbles, used in decorative landscaping, aquariums, and lapidary tumbling for hobbyists.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Rounded quartzite and quartz pebbles are extremely durable, surviving transport through rivers over hundreds of miles.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, translucent appearance, and smooth, rounded exterior from water action. Extremely common worldwide in riverbeds, beaches, and gravel pits.
