mineral

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Hardness 6.5-7 on the Mohs scale, reddish-brown to brick red color due to hematite inclusions, vitreous to waxy luster, microcrystalline/cryptocrystalline trigonal structure, fracture is conchoidal.

Identified July 24, 2026More mineral →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness 6.5-7 on the Mohs scale, reddish-brown to brick red color due to hematite inclusions, vitreous to waxy luster, microcrystalline/cryptocrystalline trigonal structure, fracture is conchoidal.

Formation & geological history

Formed when microcrystalline silica precipitated in sedimentary or volcanic environments, absorbing iron oxide minerals which gave it the distinctive red hue. Common in ancient volcanic deposits and river gravels.

Uses & applications

Used widely for lapidary work, cabochons, tumbled stone jewelry, ornamental carvings, and popular among rockhounding collectors.

Geological facts

Red Jasper has been used since antiquity for seals, amulets, and decorative items. In ancient times, it was believed to provide physical protection and spiritual grounding.

Field identification & locations

Identified by its distinctive opaque red coloration, smoothness when water-worn, and hardness (can scratch glass). Frequently found in riverbeds, lake shores, and gravel bars.