sedimentary
Jasper or Chert pebble
SiO2 (Silicon Dioxide)
Hardness: 6.5-7 (Mohs), Color: Brownish-red to reddish-brown, Luster: Dull to waxy, Opaque microcrystalline quartz
- Hardness
- 6
- Luster
- Dull to waxy, Opaque microcrystalline quartz
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Brownish-red to reddish-brown, Luster: Dull to waxy, Opaque microcrystalline quartz
Formation & geological history
Formed from silica-rich fluids that percolate through rocks or sediment, often replacing original material. Smoothness indicates tumbling in a river or marine environment.
Uses & applications
Commonly collected as river stones, used in landscaping, tumbling, or inexpensive lapidary work.
Geological facts
Jasper is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.
Field identification & locations
Identify by its hardness (scratches glass), conchoidal fracture (if broken), and opaque nature. Found abundantly in riverbeds and on beaches worldwide.
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