sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque with a waxy to dull luster, microcrystalline quartz structure with no cleavage, and a specific gravity around 2.6 to 2.7.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque with a waxy to dull luster, microcrystalline quartz structure with no cleavage, and a specific gravity around 2.6 to 2.7.
Formation & geological history
Formed through the deposition of silica-rich fluids or sediments in marine or terrestrial environments, often originating in hydrothermal veins or sedimentary deposits, and undergoing diagenesis over millions of years.
Uses & applications
Used primarily for ornamental carvings, polished stones, lapidary art, jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and ornamental jewelry, with high appreciation for its rich earth tones.
Field identification & locations
Can be identified in the field by its conchoidal fracture, lack of cleavage, microcrystalline texture, and hardness that can scratch glass. Common in riverbeds, mountainous regions, and areas with ancient volcanic or sedimentary activity.
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