sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5-7 on the Mohs scale, opaque luster (vitreous to dull), conchoidal fracture, trigonal crystal system, specific gravity of 2.55-2.70, colors range from red, brown, yellow, to green due to various mineral impurities.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster (vitreous to dull), conchoidal fracture, trigonal crystal system, specific gravity of 2.55-2.70, colors range from red, brown, yellow, to green due to various mineral impurities.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or volcanic ash beds, often during hydrothermal activity or low-temperature diagenesis over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, lapidary art, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for making seals, talismans, and jewelry, with mentions dating back to Greek, Hebrew, and Latin texts.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy to dull luster, smooth conchoidal fracture, and opaque earthy colors. Commonly found in riverbeds, coastal beaches, and mountainous regions worldwide.
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