mineral
Polished banded jasper (likely Picasso or scenic jasper)
Microcrystalline quartz (SiO₂), with iron oxides and other mineral impurities
AI-generated identification · may be incorrectOpaque, reddish-brown, cream, and gray contorted bands; vitreous to waxy luster; Mohs hardness 6.5–7; conchoidal fracture; no cleavage; cryptocrystalline quartz structure. The image appears to show a polished slab or cabochon.
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Physical properties
Opaque, reddish-brown, cream, and gray contorted bands; vitreous to waxy luster; Mohs hardness 6.5–7; conchoidal fracture; no cleavage; cryptocrystalline quartz structure. The image appears to show a polished slab or cabochon.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediments and volcanic material, with iron oxides producing red-brown coloration. Individual deposits vary widely in age, commonly Precambrian to Cenozoic.
Uses & applications
Used for cabochons, carvings, bookends, tiles, ornamental slabs, and lapidary collectibles; generally unsuitable for high-value faceting because it is opaque.
Geological facts
Banded patterns are natural and highly variable, often resembling landscapes or folded sedimentary layers. “Picasso jasper” is a trade name rather than a formally distinct mineral species.
Field identification & locations
Identify by its opaque patterned appearance, glassy polish, hardness, and inability to scratch with a steel knife; acid testing is generally unhelpful. Common sources include the western United States, Mexico, Madagascar, Australia, and South Africa.
