sedimentary
Quartz-veined Jasper
Microcrystalline quartz (SiO2) with quartz veins
Hardness of 6.5-7 on the Mohs scale, reddish-brown and brown base color with stark white quartz veinlets, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60-2.65.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown and brown base color with stark white quartz veinlets, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60-2.65.
Formation & geological history
Formed through the deposition of silica-rich sediments or volcanic ash, later fractured by tectonic activity, and subsequently healed by hydrothermal solutions precipitating white quartz into the fractures.
Uses & applications
Used primarily in lapidary arts, decorative items, tumbled stones, and specimen collecting.
Geological facts
The contrasting white veins cutting through the brown jasper create a striking mosaic pattern, sometimes referred to as crackled or veined jasper.
Field identification & locations
Easily identified by its hard, smooth polished surface, brownish iron-oxide coloration, and contrasting bright white mineral fracture fillings. Found in various riverbeds and geological formations worldwide.
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