sedimentary/mineral

Red Jasper (River Pebble)

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.5-2.9.

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to waxy

Identified July 20, 2026More sedimentary/mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.5-2.9.

Formation & geological history

Formed from the deposition of silica in hydrothermal veins or as a chemical precipitate in sedimentary environments. Its red color is derived from high hematite (iron) content. The tumbled shape indicates erosion in a high-energy water environment like a river or beach.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and decorative stones. Historically used for seals, jewelry, and as a protective talisman.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, red jasper was known as the 'stone of endurance' and was used by Egyptian artisans and Greek warriors for strength.

Field identification & locations

Identify by its opacity (even when held to light), smooth texture when weathered, and deep red streak. Commonly found in riverbeds and gravel pits globally, especially in areas with volcanic or sedimentary history.