sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque with a waxy luster, exhibits conchoidal fracture with no cleavage, colors vary widely including red, yellow, brown, and green due to various mineral impurities.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque with a waxy luster, exhibits conchoidal fracture with no cleavage, colors vary widely including red, yellow, brown, and green due to various mineral impurities.
Formation & geological history
Forms from the precipitation of silica-rich solutions in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used widely in ornamental carvings, jewelry, lapidary arts, and as a collectible gemstone.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Can be identified in the field by its hardness, conchoidal fracture, opaque nature, and lack of cleavage. Found worldwide in various geological settings.
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