sedimentary

Jasper

Microcrystalline Quartz (SiO2) with iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5 to 7 on the Mohs scale. Color: Typically red, brown, yellow, or green due to various impurities. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz aggregate). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.

Hardness: 6
Luster: Vitreous to dull

Identified August 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the silification of sedimentary or volcanic rocks or through chemical precipitation in silica-rich aqueous environments, often associated with hydrothermal activity or ancient ocean basins. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used in ornamental carvings, cabochons for jewelry, decorative objects, and as a popular specimen for rock tumbling and lapidary arts.

Geological facts

Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and talismans. Red jasper owes its distinct coloration to iron oxide inclusions.

Field identification & locations

Identified easily by its opaque nature, conchoidal fracture, and lack of cleavage combined with high hardness that scratches glass. Commonly found in riverbeds, mountainous regions, and areas with historic volcanic or sedimentary deposition worldwide.