sedimentary

Yellow Jasper

Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness of 6.5-7 on the Mohs scale, opaque yellow to brownish-yellow color with occasional contrasting veins, waxy to dull luster, and a microcrystalline or cryptocrystalline crystal structure with no visible cleavage.

Identified October 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the silification of clay-rich sediments or volcanic ash, where silica-rich groundwater replaces original minerals over millions of years.

Uses & applications

Commonly used for tumbled stones, cabochons, ornamental carvings, and lapidary jewelry.

Geological facts

Jasper has been used since ancient times for talismans, seals, and weaponry, prized by ancient civilizations like the Egyptians and Greeks.

Field identification & locations

Identified by its opaque yellow color, hardness, and lack of cleavage; found globally in alluvial deposits, riverbeds, and silicate-rich sedimentary formations.