sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Terracotta-red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91

Hardness: 6
Color: Terracotta-red to brownish-red
Luster: Vitreous to waxy

Identified April 23, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Terracotta-red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91

Formation & geological history

Formed when silica-rich fluids permeate through volcanic or sedimentary rock, often in hydrothermal veins or as nodules. Its red color comes from high concentrations of iron inclusions. It can form in various geological ages and is often found in prehistoric sedimentary deposits.

Uses & applications

Used primarily in jewelry as cabochons, beads, and tumbled stones. It is also used in decorative mosaics, ornaments, and remains a very popular stone for mineral collectors and practitioners of lithotherapy.

Geological facts

In antiquity, Red Jasper was known as the 'bringer of rain' and was widely used in ancient Egypt for amulets and scarabs. It is an opaque variety of chalcedony that owes its opacity to its high mineral inclusion content.

Field identification & locations

Identify by its deep red color, opacity (light will not pass through it even on thin edges), and its ability to scratch glass. It is commonly found in India, Brazil, South Africa, and the southwestern United States.