mineral
Jasper in Quartz / Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness of 7 on the Mohs scale. Colors include deep red, brown, white, and translucent quartz patches. Luster is vitreous to dull waxy. Crystal structure is microcrystalline (chalcedony/quartz). Conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale. Colors include deep red, brown, white, and translucent quartz patches. Luster is vitreous to dull waxy. Crystal structure is microcrystalline (chalcedony/quartz). Conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins or sedimentary environments where silica-rich fluids precipitated into fractures, often incorporating iron oxides that give the characteristic red coloration.
Uses & applications
Used for lapidary work, cabochons, carvings, ornamental objects, and geological specimen collecting.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and jewelry. The contrasting red and white/clear crystalline matrix indicates intense hydrothermal activity and healing of rock fractures.
Field identification & locations
Can be identified by its hardness (scratches glass), lack of cleavage, waxy to vitreous luster, and striking red-and-white color combination. Commonly found in quartz-bearing veins worldwide.
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