sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, dull to greasy luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, dull to greasy luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with ancient ocean deposits over hundreds of millions of years.
Uses & applications
Used for ornamental objects, cabochons, jewelry, carvings, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, with mentions in various ancient texts including the Bible and lapidary histories.
Field identification & locations
Easily identifiable in the field by its distinctive opaque reddish-brown color, conchoidal fracture, and hard quartz-like durability. Commonly found in riverbeds, mountainous regions, and areas with ancient volcanic or sedimentary activity.
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