sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, multicolored with brown, tan, and black patches, waxy to vitreous luster, amorphous to cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, multicolored with brown, tan, and black patches, waxy to vitreous luster, amorphous to cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or sediments in marine or terrestrial environments, often subjected to low-grade metamorphism or diagenesis over millions of years.
Uses & applications
Commonly used in ornamental carvings, jewelry, lapidary arts, and as a collector specimen.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans. The dark patches on this particular specimen are often due to iron oxides or manganese inclusions.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy luster, and smooth water-worn surface when found in riverbeds or beaches. Found globally.
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