sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull (polished in image); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to dull (polished in image)

Identified July 12, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull (polished in image); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica-rich micro-organisms or volcanic ash into sedimentary basins, later enriched by iron oxides. It occurs in hydrothermal veins or as a secondary mineral in igneous rocks.

Uses & applications

Commonly used for tumbled stones, decorative ornaments, jewelry (cabochons), and historically for cylinder seals and amulets.

Geological facts

Ancient Egyptians associated Red Jasper with the blood of Isis and frequently carved it into protective amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its deep red color, smooth texture, and inability to be scratched by a steel blade. Commonly found in South Africa, India, Brazil, and the USA.