sedimentary
Jasper / Quartz Pebble
Silicon dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Brown, red, white banding. Luster: Vitreous to waxy when polished by water. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (conchoidal fracture). Specific gravity: 2.60 - 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Brown, red, white banding
- Luster
- Vitreous to waxy when polished by water
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Physical properties
Hardness: 7 on Mohs scale. Color: Brown, red, white banding. Luster: Vitreous to waxy when polished by water. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (conchoidal fracture). Specific gravity: 2.60 - 2.65.
Formation & geological history
Formed via deposition of silica-rich fluids into cavities or sediments, later shaped and tumbled by wave action in a marine or river environment over thousands to millions of years.
Uses & applications
Commonly used in lapidary arts, wire-wrapping, jewelry making, and as a pocket stone for rockhounds.
Geological facts
Water-worn pebbles like this are naturally tumbled by wave action on beaches and riverbeds, smoothing away sharp edges and revealing the complex internal patterns of quartz varieties.
Field identification & locations
Found worldwide in gravel bars, beaches, and riverbeds. Identify by its high hardness (scratches glass), waxy luster, and smooth water-worn shape.
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