sedimentary
Jasper River Stone
Silicon Dioxide (SiO2) - Microcrystalline Quartz
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
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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.
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