sedimentary

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: deep brick red; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Fracture: conchoidal; Specific Gravity: 2.6-2.9.

Hardness: 6
Color: deep brick red
Luster: dull to vitreous

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: deep brick red; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Fracture: conchoidal; Specific Gravity: 2.6-2.9.

Formation & geological history

Formed from the deposition of silica-rich sediments or volcanic ash where iron impurities provide the red color. Typically occurs in hydrothermal veins or as nodules in sedimentary rocks.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and collecting.

Geological facts

The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It is an opaque variety of chalcedony. In ancient times, it was believed to bring rain and provide protection against spirits.

Field identification & locations

Identify by its solid red color, smooth waxy texture when weathered, and high hardness (cannot be scratched by a steel knife). Commonly found in stream beds or on beaches as rounded pebbles.