sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 (Mohs scale); Color: Brick red to brownish red due to iron inclusions; Luster: Dull to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91

Hardness: 6
Color: Brick red to brownish red due to iron inclusions
Luster: Dull to waxy

Identified March 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica in volcanic ash or fine-grained sediments through hydrothermal processes. The red color is caused by high concentrations of iron oxide (hematite). It is primarily found in Proterozoic and Paleozoic formations.

Uses & applications

Widely used in jewelry for cabochons and beads, ornamental carvings, and as a decorative stone in mosaics and interior design. Historically used for making tools due to its hardness and sharpness when fractured.

Geological facts

Jasper has been used throughout history as a 'nurturing stone.' The Bible mentions it as one of the stones in the breastplate of the High Priest, and it was often used in seal stones in ancient Minoan Crete and Mycenaean Greece.

Field identification & locations

Identify in the field by its deep red color, opacity (it does not transmit light even on thin edges), and its ability to scratch glass. It is commonly found in riverbeds, desert pavements, and coastal areas in regions like India, Brazil, Madagascar, and the western United States.