sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron impurities, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron impurities, conchoidal fracture.
Formation & geological history
Formed through the silica-rich precipitation in marine environments or the alteration of sediments during diagenesis.
Uses & applications
Used for ornamental objects, cabochons, jewelry, and lapidary art.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans by various civilizations including the Minoans and ancient Egyptians.
Field identification & locations
Can be identified in the field by its waxy luster, hardness, and distinct colorful banding or patterns. Commonly found in riverbeds, ancient marine deposits, and hydrothermal veins worldwide.
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