sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brown, yellow, red, and green due to impurities, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true 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, various colors including brown, yellow, red, and green due to impurities, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms from the deposition of silica-rich fluids or sediments in marine or terrestrial environments, often chemically precipitated or replacing other minerals. Can be found in sedimentary and metamorphic environments globally, dating across various geological eras.
Uses & applications
Used widely in ornamental carvings, jewelry, lapidary arts, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name comes from the Greek word iaspe, meaning 'spotted stone'.
Field identification & locations
Easily identified by its opaque nature, smooth waxy polish when tumbled or waterworn, and rich earthy colors. Commonly found in riverbeds, beaches, and mountainous regions worldwide.
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