sedimentary
Jasper in Calcite / Brecciated Jasper
Silicon dioxide with calcium carbonate (SiO2 with CaCO3)
Hardness varies from 3 (for the calcite matrix) to 7 (for the quartz/jasper fragments) on the Mohs scale. Colors include white, beige, brown, and dark reddish-purple spots. Luster is dull to vitreous. Cryptocrystalline structure.
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Physical properties
Hardness varies from 3 (for the calcite matrix) to 7 (for the quartz/jasper fragments) on the Mohs scale. Colors include white, beige, brown, and dark reddish-purple spots. Luster is dull to vitreous. Cryptocrystalline structure.
Formation & geological history
Formed through sedimentary deposition and chemical precipitation in marine environments, often later subjected to fracturing and healing by mineral-rich hydrothermal solutions (brecciation).
Uses & applications
Used primarily in lapidary arts, decorative objects, tumbled stones, and cabochons for jewelry making.
Geological facts
Brecciated rocks like this form when tectonic activity shatters existing rock layers, and circulating mineral-rich fluids subsequently cement the broken pieces back together.
Field identification & locations
Identified by contrasting hard, colorful jasper fragments embedded within a softer, lighter-colored carbonate matrix. Found globally in regions with ancient sedimentary and hydrothermal activity.
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