sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron impurities
Hardness 6.5-7 on Mohs scale; color ranges from grayish-tan to brownish-red with distinct darker vein-like fracturing and cementation; vitreous to dull luster; microcrystalline/cryptocrystalline structure; no cleavage; specific gravity ~2.6.
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Physical properties
Hardness 6.5-7 on Mohs scale; color ranges from grayish-tan to brownish-red with distinct darker vein-like fracturing and cementation; vitreous to dull luster; microcrystalline/cryptocrystalline structure; no cleavage; specific gravity ~2.6.
Formation & geological history
Formed when pre-existing jasper or chert undergoes tectonic fracturing and is subsequently re-cemented together by silica, chalcedony, or iron-rich mineral fluids.
Uses & applications
Widely used as lapidary material for tumbling, cabochons, polished decorative stones, and carved ornaments; popular among amateur rock collectors.
Geological facts
The word 'breccia' comes from the Italian word meaning 'broken gravel' or 'rubble', referring to the angular broken fragments fused together by a mineral matrix.
Field identification & locations
Identified by its mosaic-like, angular broken fragments bound by secondary mineral veins. Frequently found in stream beds, gravel deposits, and regions with ancient hydrothermally altered rock formations.
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