sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to vitreous (waxy when polished)

Identified April 13, 2026More sedimentary →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed through the deposition of silica from mineral-rich waters into the cracks or cavities of sedimentary or volcanic rocks. The red color comes from iron inclusions (hematite). It is primarily associated with ancient seabed deposits or volcanic ash beds.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for seals and amulets. It is also a popular healing stone in metaphysical circles and used in mass-market jewelry to create an earthy aesthetic.

Geological facts

Jasper is a variety of chalcedony. In ancient times, it was called the 'supreme nurturer' and was believed to provide courage and strength to warriors. It is one of the traditional birthstones for March.

Field identification & locations

Identify in the field by its deep red color, opacity (it does not let light through even at the edges), and extreme hardness—it will easily scratch glass but cannot be scratched by a steel knife. It is common in riverbeds and coastal areas globally, notably in India, Brazil, and the Southwestern USA.