sedimentary
Brecciated Jasper
Silicon dioxide (SiO2) microcrystalline quartz breccia
Hardness of 6.5-7 on the Mohs scale, multicolored with reddish-brown fragments cemented by dark matrix, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60-2.65.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, multicolored with reddish-brown fragments cemented by dark matrix, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60-2.65.
Formation & geological history
Formed through the fracturing of existing jasper rock by tectonic forces, followed by the infiltration of silica-rich hydrothermal fluids or sediments that cement the angular fragments back together over millions of years.
Uses & applications
Used primarily in lapidary arts, making cabochons for jewelry, carvings, and decorative ornamental objects, as well as valued by mineral and rock collectors.
Geological facts
Breccia refers specifically to a rock composed of broken fragments of minerals or rocks cemented together by a fine-grained matrix. The distinct mosaic pattern makes each piece entirely unique.
Field identification & locations
Easily identifiable by its sharp, angular multicolored fragments embedded in a contrasting cementing matrix. Found worldwide in areas with significant ancient hydrothermal or tectonic activity.
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