sedimentary

Red Jasper

Jasper (SiO2 with Fe2O3 inclusions)

Hardness: 6.5-7 Mohs; Color: Opaque brick red to brownish red; Luster: Dull to Vitreous/Waxy; Crystal Structure: Microcrystalline Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque brick red to brownish red
Luster: Dull to Vitreous/Waxy

Identified April 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in ash or fine sediments, often in volcanic or sedimentary environments. Its red color is derived from high iron content (Hematite inclusions) distributed throughout the silica.

Uses & applications

Used primarily as decorative stone, lapidary material for cabochons and beads, and in ornamental carvings or 'healing' crystals.

Geological facts

Jasper has been used throughout history as a gemstone; the Bible's 'Breastplate of Aaron' is said to have contained Jasper. It is a microcrystalline variety of quartz.

Field identification & locations

Identify in the field by its opacity (unlike translucent carnelian), smooth waxy feel when polished, and its inability to be scratched by a steel knife. Found widely in riverbeds, deserts, and volcanic regions.