sedimentary

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite impurities

Hardness: 6.5-7 (Mohs scale); Color: Brick red with grey/white patches; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red with grey/white patches
Luster: Dull to vitreous

Identified July 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in volcanic ash or fine-grained sediments, with iron oxides providing the red color. Typically found in Precambrian to Cenozoic formations.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, decorative carvings, and as a pocket stone for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The red color is caused by the inclusion of iron oxide, usually hematite. This specific specimen shows 'brecciated' or mottled characteristics where white quartz has filled fractures.

Field identification & locations

Identify by its opacity (jasper will not let light through except on thin edges), high hardness (cannot be scratched by a steel knife), and characteristic smooth, waxy feel when water-worn. Common in riverbeds and mountainous regions globally.

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