sedimentary

Jasper and Quartz Breccia

Silicified Breccia / Microcrystalline Quartz

Hardness of 6.5-7 on the Mohs scale, predominantly red and gray mottled colors with a contrasting white quartz vein, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, and specific gravity of approximately 2.60-2.65.

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through tectonic fracturing or faulting of pre-existing rock followed by the infiltration and cementation of silica-rich hydrothermal fluids depositing microcrystalline quartz and red jasper over millions of years.

Uses & applications

Used primarily as decorative landscape stone, lapidary material for cabochons, carvings, and ornamental display pieces for rock and mineral collectors.

Geological facts

Breccias are fragmental rocks composed of broken tectonic or sedimentary angular blocks cemented in a finer-grained matrix. The striking red color in jasper is typically due to iron oxide impurities.

Field identification & locations

Easily identified in the field by its distinct angular broken fragments (clasts) cemented together and its high hardness which easily scratches glass. Found globally in fault zones and hydrothermal environments.

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