mineral
Brecciated jasper (likely Picasso jasper)
Microcrystalline quartz (SiO₂) with iron oxides and dark manganese-oxide veinlets
AI-generated identification · may be incorrectOpaque tan, cream, brown, and gray material with black branching veins; dull to waxy luster, conchoidal-to-uneven fracture, no visible cleavage, and Mohs hardness about 6.5–7. Specific gravity is typically 2.5–2.7.
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Physical properties
Opaque tan, cream, brown, and gray material with black branching veins; dull to waxy luster, conchoidal-to-uneven fracture, no visible cleavage, and Mohs hardness about 6.5–7. Specific gravity is typically 2.5–2.7.
Formation & geological history
Silica-rich groundwater or volcanic fluids replaced and cemented fractured rock, while iron and manganese oxides produced the contrasting colors and veining. It is generally a relatively young, weathering-related jasper, though exact age depends on locality.
Uses & applications
Used for cabochons, beads, carvings, polished slabs, and ornamental objects; rarely used industrially because its value is primarily decorative.
Geological facts
The name “Picasso jasper” is a lapidary trade name rather than a single formally defined mineral species. Its patterns resemble painted brushstrokes or abstract landscapes.
Field identification & locations
Identify it by its opaque fine-grained quartz texture, hardness, lack of cleavage, and dark mineral-filled fractures; it should scratch glass but not be scratched by a steel knife. Similar brecciated jasper and iron-stained chert occur worldwide, especially in volcanic and hydrothermal terrains.
