sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs); Color: deep brick red; Luster: dull to vitreous when wet/polished; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91

Hardness: 6
Color: deep brick red
Luster: dull to vitreous when wet/polished

Identified April 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from volcanic ash or hydrothermal solutions into voids and sedimentary layers. The red color comes from high concentrations of hematite (iron) during formation.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone due to its ability to take a high polish.

Geological facts

Jasper has been used for thousands of years; in ancient times, it was considered a 'rain bringer.' It is a member of the chalcedony family, distinguished by its opacity and iron content.

Field identification & locations

Identify by its solid red color, inability to be scratched by a steel knife, and smooth texture when water-worn. Commonly found in riverbeds and areas with volcanic activity or ancient sedimentary basins.