sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, yellow, brown, and green, trigonal crystal system, conchoidal fracture with no distinct cleavage, specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, yellow, brown, and green, trigonal crystal system, conchoidal fracture with no distinct cleavage, specific gravity of 2.60 to 2.65.
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine sediments over millions of years.
Uses & applications
Used primarily in lapidary work, decorative objects, cabochons for jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in ancient texts.
Field identification & locations
Can be identified in the field by its waxy luster, opaque nature, hardness that scratches glass, and microcrystalline texture. Commonly found in riverbeds, mountainous regions, and areas with ancient volcanic or sedimentary activity.
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