sedimentary

Red Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Red, brown, earthy tones; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red, brown, earthy tones
Luster: Vitreous to waxy

Identified June 3, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Red, brown, earthy tones; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Forms when silica-rich fluids deposit in volcanic rock cavities or sedimentary layers. The red color comes from high iron inclusions. It can form in various geological ages alongside other chalcedony varieties.

Uses & applications

Widely used in jewelry (beads, cabochons), ornamental carvings, and as a popular stone for tumble-polishing and spiritual collections.

Geological facts

Jasper is a variety of chalcedony that contains up to 20% foreign materials which determine its opacity and color patterns. It has been used since antiquity for seals and talismans.

Field identification & locations

Identify by its deep red color, opacity (it does not let light through even at thin edges), and its ability to scratch glass. Commonly found in riverbeds and desert environments globally, notably in the USA, India, and Brazil.