mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to dull

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich hydrothermal fluids in cracks and cavities of volcanic or sedimentary rocks, often associated with Banded Iron Formations (BIFs). The red color is due to the presence of iron oxide (hematite).

Uses & applications

Used primarily for semi-precious jewelry (beads, cabochons), ornamental carvings, stone therapy, and as a decorative stone in mosaics.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, it was known as the 'rain bringer' and was highly valued by many cultures, including the Egyptians and Native Americans, for its protective properties.

Field identification & locations

Identify in the field by its deep red color, opacity (light will not pass through even thin edges), and its ability to scratch glass. Widely found in the USA (Oregon, Idaho), Brazil, India, and South Africa.

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