metamorphic
Polished Picasso jasper
Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species
AI-generated identification · may be incorrectTypically opaque cream, gray, tan, and dark-brown angular or flowing veining with a waxy to vitreous polish; mainly microcrystalline quartz with carbonate and iron/manganese oxides. Mohs hardness is about 6–7; massive, with no visible cleavage and specific gravity roughly 2.6–2.8.
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Physical properties
Typically opaque cream, gray, tan, and dark-brown angular or flowing veining with a waxy to vitreous polish; mainly microcrystalline quartz with carbonate and iron/manganese oxides. Mohs hardness is about 6–7; massive, with no visible cleavage and specific gravity roughly 2.6–2.8.
Formation & geological history
Formed when carbonate-rich sediments were altered and variably silicified, with mineral-rich fluids producing the distinctive dark veining; commonly associated with Paleozoic carbonate sequences, especially in Utah, USA. The exact age depends on the deposit.
Uses & applications
Used as cabochons, worry stones, carvings, beads, and decorative objects; it has little industrial value compared with ordinary jasper.
Geological facts
The name “Picasso jasper” is a lapidary trade name, not a formally defined mineral species; similar material may be sold as Picasso stone or marble jasper.
Field identification & locations
Identify it by its polished surface and strongly contrasting, geometric brown-black veining in a pale matrix; it is opaque and should not show quartz-like transparency. Commonly sourced from Utah and other western U.S. deposits.
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