sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, typically comes in various earthy tones including red, brown, yellow, and green, with a microcrystalline crystal structure and no true cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, typically comes in various earthy tones including red, brown, yellow, and green, with a microcrystalline crystal structure and no true cleavage.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often dating from various geological eras including the Precambrian.
Uses & applications
Used primarily for ornamental objects, cabochons, carved items, and in jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and various decorative arts by civilizations such as the ancient Egyptians, Minoans, and Romans.
Field identification & locations
Found worldwide in riverbeds, sedimentary deposits, and hydrothermal veins; identified by its opaque nature and smooth, water-worn texture when tumbled naturally.
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