Red Jasper

Physical Properties

Hardness: 6.5-7 on the Mohs scale; Color: Rusty red to brownish-red; Luster: Dull to vitreous; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & Geological History

Forms when silica-rich fluids permeate through volcanic or sedimentary rocks. The red color is caused by the presence of iron oxide (hematite) during the microcrystalline quartz formation.

Uses & Applications

Used primarily for jewelry (cabochons), interior decoration, and as a semi-precious gemstone in ornamental carvings.

Geological Facts

Red Jasper has been used since ancient times for amulets and carvings; it was once known as the 'bringer of rain' in certain cultures. It is often found in large nodules or as part of Banded Iron Formations.

Field Identification & Locations

Identify by its waxy to dull luster, lack of cleavage, and smooth, often conchoidal fracture. Commonly found in riverbeds or gravel deposits in areas with volcanic history.

Identified on: 4/30/2026

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