Red Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Deep red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Formation & Geological History

Formed through the accumulation of silica-rich fluids in volcanic or sedimentary environments, often associated with banded iron formations. The red color is due to iron (hematite) impurities integrated during the cooling and mineralization of the silica.

Uses & Applications

Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, spiritual/metaphysical collections, and historically for tools due to its conchoidal fracture.

Geological Facts

Jasper was a favorite gem in the ancient world; it is mentioned in the Bible as being one of the stones in the High Priest's breastplate. Red Jasper is often called the 'stone of endurance' in folklore.

Field Identification & Locations

Identify in the field by its opaque nature (unlike agate which is translucent), its smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments globally, notably in the USA, Brazil, and India.

Identified on: 4/19/2026

Mode: Standard