sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, typically opaque with various earthy colors including red, brown, yellow, and green, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, typically opaque with various earthy colors including red, brown, yellow, and green, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.58-2.91.
Formation & geological history
Forms from the precipitation of silica-rich water in sedimentary environments, or through hydrothermal solutions altering existing rocks, often taking millions of years.
Uses & applications
Used in ornamental carvings, jewelry making, lapidary art, and as a decorative stone.
Geological facts
Jasper has been prized since ancient times for seals, talismans, and jewelry, mentioned in numerous historical texts including the Bible.
Field identification & locations
Identified by its waxy luster, opaque nature, hardness that scratches glass, and characteristic colorful bands or patterns. Found worldwide in riverbeds and mountainous regions.
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