sedimentary

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Hardness: 6.5 to 7 on the Mohs scale. Color: Red, brownish-red, or reddish-brown due to iron oxide impurities. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.

Hardness: 6
Luster: Vitreous to dull

Identified August 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the hydrothermal deposition of silica-rich fluids or precipitation of silica in marine environments, often associated with iron formations and volcanic activity, dating from various geological eras including the Precambrian.

Uses & applications

Used for ornamental objects, cabochons, carved items, jewelry, and as a popular specimen for rock collectors.

Geological facts

Jasper has been used since ancient times for talismans, seals, and weaponry. Red jasper was particularly valued by ancient Egyptians and Native Americans for its protective and grounding symbolism.

Field identification & locations

Can be identified in the field by its opaque red color, waxy-to-dull luster, hardness that scratches glass, and smooth conchoidal fracture. Commonly found in stream beds, gravel deposits, and sedimentary rock formations worldwide.

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