sedimentary
Yellow Jasper
Quartz (Silicon Dioxide, SiO2 with impurities)
Hardness of 6.5 to 7 on the Mohs scale, yellow to brownish-yellow color due to iron oxide inclusions, waxy to dull luster, microcrystalline (cryptocrystalline) quartz structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, yellow to brownish-yellow color due to iron oxide inclusions, waxy to dull luster, microcrystalline (cryptocrystalline) quartz structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich sediments in marine or terrestrial environments, often involving the replacement of organic material or alteration of volcanic ash, consolidated over millions of years.
Uses & applications
Used primarily in lapidary arts, making cabochons, beads, decorative carvings, and as a collector's mineral specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The yellow variety is traditionally associated with stability and mental clarity.
Field identification & locations
Can be identified in the field by its opaque yellow color, smooth waxy texture, and high hardness that scratches glass. Found worldwide, particularly in regions with ancient volcanic or sedimentary activity.
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