sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5-7 on the Mohs scale, red and black mottled color, waxy to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58-2.91
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Physical properties
Hardness of 6.5-7 on the Mohs scale, red and black mottled color, waxy to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58-2.91
Formation & geological history
Formed through the deposition and consolidation of silica-rich sediments in marine or hydrothermal environments, often over hundreds of millions of years
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a collector's specimen
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. The red and black colors in this specific specimen are due to iron oxide impurities and potential basaltic or carbonaceous inclusions.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy luster, and opaque appearance. Commonly found in riverbeds, beaches, and areas with ancient volcanic or sedimentary activity.
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