sedimentary
Brecciated Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, opaque transparency, and conchoidal fracture. It displays an intricate pattern of red, brown, and black fragments cemented together by secondary quartz.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, opaque transparency, and conchoidal fracture. It displays an intricate pattern of red, brown, and black fragments cemented together by secondary quartz.
Formation & geological history
Formed when existing jasper or rock layers were fractured by tectonic activity and the resulting fragments were subsequently cemented together by silica-rich hydrothermal fluids or silica deposition in sedimentary environments.
Uses & applications
Commonly used for lapidary work, making polished tumbled stones, cabochons for jewelry, decorative carvings, and as a collector's specimen.
Geological facts
Brecciated jasper gets its vibrant red colors primarily from iron oxide inclusions. The process of brecciation creates a striking mosaic or 'broken' appearance that makes every specimen completely unique.
Field identification & locations
Easily identified by its hardness, opaque nature, conchoidal fracture, and characteristic multi-colored fractured appearance. Found worldwide including in India, Brazil, Russia, and parts of the United States.
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