sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, red/brown/multicolored, waxy to dull luster, cryptocrystalline 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, red/brown/multicolored, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.58-2.91.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or filling volcanic vesicles, often associated with ancient marine or hydrothermal activity.
Uses & applications
Used for ornamental carvings, cabochons, jewelry, and decorative landscaping stones.
Geological facts
Jasper has been used since antiquity for seals, signet rings, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Identified by its opaque nature, hardness, and distinct color patterns veined with impurities like iron oxides; commonly found in riverbeds, alluvial gravels, and hydrothermal veins worldwide.
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