Brown Jasper

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Chocolate brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Formation & Geological History

Formed via the deposition of silica from water or during volcanic processes. It occurs as nodules or in cracks, taking millions of years to solidify into chert/jasper forms.

Uses & Applications

Used primarily for lapidary work, jewelry (cabochons), talismans, and as polished decorative stones.

Geological Facts

The brown color is typically caused by goethite or iron oxide. Jasper is an opaque variety of chalcedony. Historically, it was known as a 'nurturing stone' in ancient cultures.

Field Identification & Locations

Identify by its high hardness (doesn't scratch with a steel knife), smooth conchoidal fracture, and absolute opacity. Commonly found in riverbeds and arid regions globally.

Identified on: 5/11/2026

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