sedimentary
Jasper River Stone
Silicon Dioxide (SiO2) with iron oxide inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Reddish-brown, tan, and grey banding; Luster: Dull to waxy; Structure: Microcrystalline quartz; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Reddish-brown, tan, and grey banding
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Reddish-brown, tan, and grey banding; Luster: Dull to waxy; Structure: Microcrystalline quartz; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds, later smoothed into an oval shape by water erosion in a river or beach environment.
Uses & applications
Used for lapidary work, decorative landscaping, pocket stones, and as an abrasive in rock tumblers.
Geological facts
Jasper is an opaque variety of chalcedony. The red and brown colors are typically caused by high iron content within the silicate matrix.
Field identification & locations
Identify in the field by its smoothness, opacity (it does not let light through even on thin edges), and inability to be scratched by a steel knife. Commonly found in riverbeds and glacial tills.
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