sedimentary

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive crystal structure with conchoidal fracture, and specific gravity around 2.65. Colors vary widely including brown, red, yellow, and green due to various mineral impurities.

Identified November 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through the silica-rich precipitation in marine environments or alteration of sedimentary and volcanic rocks, often occurring in hydrothermal veins.

Uses & applications

Used primarily for ornamental carvings, polished cabochons in jewelry, and decorative landscaping stones.

Geological facts

Jasper has been utilized by ancient civilizations since prehistoric times for tools, weapons, and sacred talismans. It is a variety of chalcedony.

Field identification & locations

Easily identified by its opaque appearance, waxy luster, and conchoidal fracture. Found worldwide in riverbeds, ancient marine deposits, and volcanic regions.