sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, reddish-brown color, waxy to vitreous 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, reddish-brown color, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.58-2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or sediments in marine environments or hydrothermal settings, often associated with iron-rich deposits over millions of years.
Uses & applications
Used for making jewelry, ornamental carvings, lapidary art, and occasionally in industry as a grinding agent or historical flint-like tools.
Geological facts
Jasper has been used since antiquity for seals, signet rings, and talismans by ancient civilizations including the Minoans, Egyptians, and Romans. Red jasper gets its distinct color from iron oxide inclusions.
Field identification & locations
Identified in the field by its opaque nature, conchoidal fracture, smooth tumbled appearance, and resistance to scratching by a steel knife. Commonly found in riverbeds, coastal areas, and mountainous regions worldwide.
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