sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from red, brown, yellow to green, dull to greasy luster, 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, color ranges from red, brown, yellow to green, dull to greasy luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash and ancient ocean beds over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, decorative objects, and as a polishing material.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry by civilizations such as the ancient Egyptians, Greeks, and Native Americans.
Field identification & locations
Can be identified in the field by its opaque nature, waxy luster, conchoidal fracture, and lack of reactivity to acid. Commonly found in riverbeds, mountainous regions, and areas with historic volcanic activity.
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