sedimentary
Map Jasper (Grey Picasso Jasper)
Silicon Dioxide (SiO2) with impurities
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 More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary