sedimentary
Jasper and Quartz Breccia
Silicified rock / Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, mottled red and white/grey coloration, vitreous to dull luster, cryptocrystalline structure with no true cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, mottled red and white/grey coloration, vitreous to dull luster, cryptocrystalline structure with no true cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the fracturing of existing rock followed by the cementation of angular fragments by silica-rich hydrothermal fluids or groundwater precipitation over millions of years.
Uses & applications
Used primarily in lapidary arts for cabochons, carvings, ornamental objects, and as a collector specimen.
Geological facts
Brecciated jaspers often display a chaotic and artistic mosaic of colors created by iron oxide staining within the silica matrix.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), conchoidal fracture, and distinctive red and white mottled pattern. Found globally in areas with extensive hydrothermal or tectonic activity.
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