sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in various earth tones like red, brown, yellow, and green, trigonal crystal structure, no cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in various earth tones like red, brown, yellow, and green, trigonal crystal structure, no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often found in association with iron-rich formations.
Uses & applications
Used for making ornamental objects, cabochons, carvings, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Can be identified in the field by its conchoidal fracture, lack of streak, and waxy luster. Commonly found worldwide in riverbeds, alluvial deposits, and mountainous regions.
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