Sedimentary / Mineral
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Hardness: 6.5-7, Color: Red to reddish-brown, Luster: Waxy to dull, Crystal structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: Red to reddish-brown, Luster: Waxy to dull, Crystal structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments, often replacing other minerals or forming nodules. Red color comes from iron oxide inclusions.
Uses & applications
Used primarily as a lapidary material, for carving, cabochons, and ornamental objects. Uncut material carries little industrial value.
Geological facts
Red jasper has been used since antiquity for seals, amulets, and decorative items. Its conchoidal fracture made it useful for tools in prehistoric times.
Field identification & locations
Identified by its hardness (scratches glass), opacity, red color, and lack of visible grains. Common worldwide in sedimentary contexts.
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