sedimentary

Red Jasper

Red Jasper (SiO2)

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

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

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks. The red color is caused by high iron (hematite) inclusions incorporated during the sedimentation process.

Uses & applications

Used extensively in jewelry for cabochons and beads, ornamental carvings, and as a popular stone for lapidary tumbling and meditation practices.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since antiquity; the Bible mentions it as one of the stones in the breastplate of the high priest. It is often smooth to the touch due to its fine grain.

Field identification & locations

Identified in the field by its opaque nature (unlike translucent carnelian), its red streak, and conchoidal fracture. Found worldwide in stream beds, deserts, and coastal areas.