Red Jasper

Physical Properties

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & Geological History

Formed through the deposition of silica from water in cavities or as a byproduct of metamorphic and sedimentary processes. The red color is caused by iron oxide (hematite) impurities during formation.

Uses & Applications

Commonly used in lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular specimen for crystal collecting.

Geological Facts

Jasper has been used throughout history as a gemstone. In ancient times, it was frequently used for seals and talismans. It is an opaque variety of chalcedony.

Field Identification & Locations

Identify in the field by its opaque nature, smooth waxy texture when polished, and high hardness (it will scratch glass). Often found in riverbeds or near silica-rich volcanic environments.

Identified on: 4/23/2026

Mode: Standard