mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Red, brick-red, terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Red, brick-red, terracotta
Luster: Vitreous to dull

Identified February 5, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Red, brick-red, terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed as a result of silica-rich fluids permeating through hydrothermal veins or volcanic ash. The red color is caused by high concentrations of iron oxide (hematite) inclusions within the quartz matrix.

Uses & applications

Commonly used in jewelry as cabochons, for ornamental sculptures, in masonry (decorative flooring), and as 'pocket stones' for collectors. Historically used for seals and amulets.

Geological facts

Ancient Egyptians often wore red jasper amulets in the shape of the 'Tyet' (Isis knot) to symbolize the blood of Isis. It is a microcrystalline variety of quartz and is frequently found in large beds known as jaspillite.

Field identification & locations

Identify in the field by its deep red color, conchoidal fracture, and inability to be scratched by a steel knife. Common locations include Brazil, India, USA (Southwest), and South Africa.

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