sedimentary

Red Jasper

Microcrystalline quartz (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5-7; reddish-brown color due to iron; waxy to vitreous luster; microcrystalline or cryptocrystalline crystal structure; conchoidal fracture with no cleavage; specific gravity 2.58-2.91.

Identified November 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from the silica-rich precipitation of hydrothermal solutions or silica-rich oozes, often in marine environments, with iron impurities causing the red coloration over millions of years.

Uses & applications

Commonly used for tumbled stones, cabochons, carved ornaments, decorative objects, and lapidary work.

Geological facts

Red jasper has been used since ancient times for amulets, seals, and weaponry components by various civilizations including the ancient Egyptians and Romans.

Field identification & locations

Easily identified by its opaque red color, hardness that scratches glass, and smooth waxy feel when tumbled. Found globally, especially in India, Brazil, Russia, and the USA.