sedimentary

Map Jasper (Grey Picasso Jasper)

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Grey, black, and white swirling patterns; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Grey, black, and white swirling patterns
Luster: Vitreous to dull

Identified May 3, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Grey, black, and white swirling patterns; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9

Formation & geological history

Formed through the deposition of silica from water into cracks and voids of other rocks, often associated with iron or manganese oxides that create the unique veining. Developed over millions of years through hydrothermal processes.

Uses & applications

Primarily used for ornamental beads, jewelry, cabochons, and as a polished healing or meditation stone. Popular in artisan beadwork and boho-style accessories.

Geological facts

Despite being called 'Picasso Jasper', it is actually a form of metamorphosed limestone or a marble-like chalcedony that has developed web-like patterns similar to abstract paintings.

Field identification & locations

Identify by its unique 'map-like' or 'sketched' dark veins against a grey background and its high hardness (it cannot be scratched by a steel knife). Commonly found in Utah, USA.