sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58–2.91

Hardness: 6
Color: Deep Brick Red
Luster: Dull to Vitreous

Identified April 26, 2026More sedimentary →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash, which then solidifies into a microcrystalline quartz. The red color comes from high concentrations of iron oxide (hematite) during formation.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a collector's specimen.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, Red Jasper was known as the 'stone of endurance' and was often used in the amulets of Egyptian priests and warriors.

Field identification & locations

Identify in the field by its distinct opaque red color, smooth conchoidal fracture (curved breaks), and extreme hardness (it will scratch glass). Commonly found in areas with volcanic activity or ancient sedimentary beds.