sedimentary

Jasper River Stone

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Tan, beige, and reddish-brown; Luster: Waxy to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Tan, beige, and reddish-brown
Luster: Waxy to dull

Identified July 13, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Tan, beige, and reddish-brown; Luster: Waxy to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds. This specific specimen shows intense water-wear, indicating a history of transport in a river or stream environment over thousands of years.

Uses & applications

Commonly used as decorative landscaping stone, in aquarium decor, or as a source material for rock tumbling and lapidary arts.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone.' River-worn specimens like this are often found far from their original source due to glacial or fluvial movement.

Field identification & locations

Identify in the field by its smoothness, opacity (unlike translucent agate), and hardness—it will easily scratch glass. Look for them in gravel bars, dry creek beds, and glacial till areas.