sedimentary
Jasper Pebble
Microcrystalline Quartz (Chalcedony), SiO2
Hardness: 6.5-7 on the Mohs scale; Color: Brown, mottled, or earthy tones; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brown, mottled, or earthy tones
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Brown, mottled, or earthy tones; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in marine or terrestrial environments, often altered by hydrothermal activity or diagenesis over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carving, and as a common tumbled stone for collectors.
Geological facts
Jasper has been used throughout human history since ancient times for amulets, seals, and tools due to its durability and capacity to take a high polish.
Field identification & locations
Found worldwide in riverbeds, beaches, and gravel deposits where weathering-resistant quartz pebbles are smoothed by water action over time.
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