sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale), Color: Red, brown, and white, Luster: Dull to vitreous in quartz areas, Structure: Microcrystalline (Jasper) and Trigonal (Quartz), Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Red, brown, and white, Luster: Dull to vitreous in quartz areas, Structure: Microcrystalline (Jasper) and Trigonal (Quartz), Cleavage: None
Formation & geological history
Formed from the deposition of silica-rich fluids within volcanic or sedimentary rock fractures. The red coloration is typically caused by iron oxidation. Date back to various geological eras, commonly Paleozoic or Mesozoic depending on location.
Uses & applications
Used primarily for ornamental purposes, lapidary work (cabbing), jewelry making, and as decorative landscaping stone.
Geological facts
Jasper is an opaque variety of chalcedony. The presence of white quartz veins in red jasper is often referred to as 'Bresciated Jasper' if it has been broken and reformed, though this specimen shows distinct vein filling.
Field identification & locations
Look for a heavy, dense rock that cannot be scratched by a steel knife. It is commonly found in riverbeds and desert environments such as the American Southwest and South Africa.
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