sedimentary
Brecciated Jasper
SiO2 (Silicon Dioxide)
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and exhibits a multicolored pattern of angular rock fragments cemented together by fine-grained quartz or chalcedony.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and exhibits a multicolored pattern of angular rock fragments cemented together by fine-grained quartz or chalcedony.
Formation & geological history
Formed through tectonic activity or faulting that shatters existing rock formations (often chert or jasper), followed by hydrothermal fluids circulating through the fractures and cementing the broken fragments with silica over millions of years.
Uses & applications
Used primarily in lapidary arts, making cabochons, polished decorative stones, beads, carved ornaments, and as a collectible specimen.
Geological facts
The distinctive network of veins forms a natural mosaic pattern, making every specimen of brecciated jasper completely unique.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), blocky angular fragments cemented in contrasting colors (often reds, browns, and whites), and smooth waxy feel when polished. Found worldwide in areas with significant ancient faulting and volcanic activity.
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