sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, typically opaque with a waxy to vitreous luster, displays a smooth conchoidal fracture, and comes in various earthy colors including yellowish-brown, red, green, and brown due to iron and other mineral impurities.

Identified August 1, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the precipitation of silica-rich fluids or accumulation of siliceous oozes in marine or terrestrial environments, subsequently undergoing diagenesis and compaction over millions of years.

Uses & applications

Used primarily in lapidary arts, ornamental carvings, cabochons, beads, and sometimes in specialized industrial applications as an abrasive or grinding medium.

Geological facts

Jasper has been utilized by humans since ancient times for tools, seals, and ornamentation. The coordinate location near São Paulo, Brazil, is well-known for diverse geological formations including various quartz varieties.

Field identification & locations

Can be identified by its microcrystalline structure, lack of visible grain without magnification, waxy luster, and high hardness that scratches glass easily. Common in stream gravels and sedimentary deposits worldwide.