sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, green, and yellow due to iron oxide impurities, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, green, and yellow due to iron oxide impurities, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture.
Formation & geological history
Formed by the precipitation of silica from water in ancient marine environments, often associated with hydrothermal activity or volcanic ash deposition over millions of years.
Uses & applications
Commonly used in making jewelry such as beads, cabochons, carved ornaments, and decorative items.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with references dating back to Greek, Hebrew, and Roman texts.
Field identification & locations
Identified by its opaque nature, high hardness that scratches glass, and vibrant multicolored patterns. Found worldwide, particularly in India, Russia, Brazil, and the USA.
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