sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from brown, red, yellow to green due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, color ranges from brown, red, yellow to green due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed in marine or silica-rich sedimentary environments where silica-rich fluids precipitate or replace other minerals, often occurring within hydrothermal veins or sedimentary beds over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens for rockhounds and collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and decorative implements, valued by many ancient civilizations including the Minoans and Egyptians.
Field identification & locations
Can be identified in the field by its smooth water-worn texture on beaches or riverbeds, lack of fizz with acid, high hardness (scratches glass), and opaque earthy or brightly colored appearance. Common globally.
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