mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Tan, beige, translucent white; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal (microcrystalline in this form); Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Tan, beige, translucent white
- Luster
- Vitreous to waxy (when water-worn)
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Physical properties
Hardness: 7 (Mohs scale); Color: Tan, beige, translucent white; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal (microcrystalline in this form); Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes or within igneous rocks like granite. This specific specimen has been shaped by fluvial (river) erosion, rounding the edges over thousands of years.
Uses & applications
Primarily used as decorative stone, construction aggregate, or in landscaping. Quartz is also the primary source of silica for glass manufacturing.
Geological facts
Quartz is the most abundant mineral in Earth's continental crust. These rounded pebbles are often called 'river rocks' and are indicators of past or present water flow.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Common in riverbeds, beaches, and glacial deposits worldwide. Collectors often look for unique inclusions or colors.
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