mineral

Jasper River Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5-7 on the Mohs scale; Color: Reddish-brown, earthy tones; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown, earthy tones
Luster: Dull to waxy

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on the Mohs scale; Color: Reddish-brown, earthy tones; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, often later rounded by fluvial action (river transport) over thousands of years.

Uses & applications

Used primarily for lapidary work, decorative landscaping, aquarium stones, and as a pocket stone for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and amulets since antiquity.

Field identification & locations

Identify in the field by its smoothness, opacity (it does not transmit light even on thin edges), and inability to be scratched by a steel knife. Commonly found in riverbeds and gravel pits.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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