sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from red, brown, yellow to green, waxy to dull luster, amorphous or cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, color ranges from red, brown, yellow to green, waxy to dull luster, amorphous or cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Forms by the precipitation of silica from aqueous fluids in sedimentary environments or hydrothermal veins, often associated with iron-rich deposits. Ages vary widely from Precambrian to Cenozoic.
Uses & applications
Used for ornamental objects, cabochons, carved items, and in jewelry making.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Easily identified by its opaque nature, vibrant or earthy colors, and hard, smooth tumbled finish. Found worldwide in riverbeds and rock formations.
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