Red Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull (waxy when polished), Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Formation & Geological History

Formed via the deposition of silica from hydrothermal solutions or volcanic ash, combined with iron oxide impurities that provide the red pigment. It is often found in prehistoric sedimentary deposits or as secondary fillings in cracks of other rocks.

Uses & Applications

Widely used for ornamental jewelry, cabochons, polished pocket stones, and decorative carvings. Historically used for making tools and seals.

Geological Facts

Red Jasper has been used since antiquity; it was known as the 'mother of all stones' in some cultures and was often featured in the breastplates of high priests. It is a variety of chalcedony.

Field Identification & Locations

Identify in the field by its opaque deep red color, high hardness (cannot be scratched by a steel knife), and smooth conchoidal fracture. Common in locations like India, Russia, Brazil, and the Southwestern USA.

Identified on: 5/11/2026

Mode: Standard