Red Jasper

Physical Properties

Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep reddish-brown; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & Geological History

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its distinctive red color comes from high concentrations of iron oxide (hematite) during the deposition process. It is found in many geological ages from Precambrian to recent.

Uses & Applications

Commonly used as a gemstone for lapidary work, decorative carvings, and beads. Historically used for architectural elements, seals, and talismans. Occasionally used in industrial applications requiring high hardness.

Geological Facts

Red Jasper was known as the 'stone of endurance' in ancient cultures. It has been used since antiquity for ornaments and was mentioned in the Bible as one of the stones in the High Priest's Breastplate.

Field Identification & Locations

Identify by its deep red color, high hardness (cannot be scratched by a steel knife), and smooth, conchoidal fracture. Often found as rounded pebbles in riverbeds or as large veins in rocky outcrops. Common locations include India, Brazil, USA, and South Africa.

Identified on: 4/27/2026

Mode: Standard