sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with a waxy to dull luster, conchoidal fracture, and colors ranging from reddish-brown to yellow, orange, and green depending on iron oxide impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with a waxy to dull luster, conchoidal fracture, and colors ranging from reddish-brown to yellow, orange, and green depending on iron oxide impurities.
Formation & geological history
Formed through the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling cracks in existing rocks over millions of years.
Uses & applications
Widely used in ornamental carvings, cabochons, jewelry, mosaic work, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used by ancient civilizations for over 6,000 years to make tools, seals, and amulets. It is mentioned in various historical and religious texts for its beauty and perceived protective properties.
Field identification & locations
Easily identified by its distinctive opacity, microcrystalline texture, conchoidal fracture surfaces, and warm earth-tone colors. Found worldwide, particularly in regions with ancient volcanic activity or sedimentary deposits.
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