sedimentary

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions

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

Hardness: 6
Color: Brick red to brownish-red due to iron oxide impurities
Luster: Vitreous to dull

Identified July 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich sediments in marine environments, often associated with banded iron formations, heavily permeated and colored by iron oxide particles during diagenesis.

Uses & applications

Used primarily in lapidary arts, ornamental carvings, cabochons, beads, and as a popular specimen for mineral collectors.

Geological facts

Jasper has been used since ancient times for talismans, seals, and jewelry. Red jasper specifically was 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 reddish color, hardness that can scratch glass, and smooth conchoidal fracture. Found worldwide, with notable deposits in India, Russia, Brazil, and the USA.

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