sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate microcrystalline quartz in pore spaces or fractures, often in ancient marine or hydrothermal environments.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, polished cabochons for jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and decorative items. Red jasper specifically gets its vibrant color from hematite or iron oxide impurities.
Field identification & locations
Can be identified in the field by its conchoidal fracture, opaque appearance, microcrystalline texture, and hardness that scratches glass. Found worldwide in riverbeds, gravel deposits, and hydrothermal vein systems.
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