sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the precipitation of silica-rich solutions in sedimentary environments or hydrothermal veins, often associated with ancient marine deposits and volcanic activity.
Uses & applications
Used in lapidary arts, decorative objects, cabochons for jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools. The name means 'spotted or speckled stone' and originates from Greek.
Field identification & locations
Identified by its opaque appearance, hardness that scratches glass, and smooth, water-worn texture when found in riverbeds. Found worldwide.
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