sedimentary

Red Jasper

Microcrystalline Quartz (SiO2 with Iron Oxide impurities)

Hardness: 6.5-7 Mohs; Color: Opaque red with yellow/tan banding; Luster: Vitreous to dull; Crystal system: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque red with yellow/tan banding
Luster: Vitreous to dull

Identified July 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary environments. The red coloration is caused by iron (hematite) inclusions. Many banded varieties are ancient sedimentary deposits transformed by silica or geothermal heat.

Uses & applications

Used extensively as a gemstone, in lapidary work for cabochons and beads, for decorative carvings, and as a historical material for seals and ornamentation.

Geological facts

Jasper was a favorite gem in the ancient world, mentioned in biblical texts and used in the Minoan civilization of Crete. It is often referred to as the 'Supreme Nurturer' in metaphysical circles.

Field identification & locations

Identify in the field by its opacity, waxy texture on broken surfaces, and hardness (cannot be scratched by a steel pocketknife). Commonly found in riverbeds or arid regions in India, Russia, Brazil, and the USA (southwest and Pacific Northwest).

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