sedimentary/mineral

Red Jasper (River Polished)

Silicon Dioxide (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal/Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

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

Identified April 21, 2026More sedimentary/mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in ash or sediments, often in volcanic or sedimentary environments. Iron oxide (hematite) provides the red color. This specific specimen has been further shaped by river or water erosion, giving it a smooth, rounded appearance.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and pocket stones. Historically used for seals, jewelry, and carvings. Also popular in the holistic/metaphysical community.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It has been used by humans for thousands of years, including for making bow-drills in Neolithic times.

Field identification & locations

Identify in the field by its opacity (unlike translucent carnelian), its red streak on a streak plate, and its inability to be scratched by a steel knife. Commonly found in gravel beds and along riverbanks globally.