Sedimentary/Metamorphic

Red Jasper

Jasper (Silicon Dioxide with Iron inclusions - SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brownish red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep brownish red
Luster: Dull to vitreous

Identified April 18, 2026More sedimentary/metamorphic →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in cracks, crevices, or as a replacement for organic material. Its red color is derived from iron oxide (hematite) inclusions that occur during its long-term formation process in volcanic or sedimentary environments.

Uses & applications

Commonly used as a gemstone for jewelry (cabochons, beads), decorative ornaments, and metaphysical 'healing' stones. Historically used for making tools due to its hardness and sharp fracture edges.

Geological facts

Jasper has been used as a gemstone since antiquity and is mentioned in the Bible as being one of the stones in the breastplate of the High Priest. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its deep red color, characteristic waxy to dull luster, and its inability to be scratched by a steel knife. It is frequently found in riverbeds, deserts, or coastal areas where erosion has exposed silica-rich deposits. Common locations include Brazil, India, and the Southwestern USA.

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