sedimentary
Jasper Pebble
Microcrystalline Quartz (Chalcedony), SiO2
Hardness: 6.5-7 on the Mohs scale; Color: Brown, reddish-brown, tan, or orange; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brown, reddish-brown, tan, or orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Brown, reddish-brown, tan, or orange; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, often subsequently weathered, eroded, and smoothed by water action into pebbles.
Uses & applications
Used for lapidary work, decorative stones, tumbled stones, and making jewelry or cabochons.
Geological facts
Jasper has been used since ancient times for talismans, seals, and ornamentation. The name means 'spotted or speckled stone'.
Field identification & locations
Found worldwide in riverbeds, beaches, and glacial deposits. Identify by its opacity, hardness (scratches glass), waxy luster, and conchoidal fracture.
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