metamorphic
Picasso Jasper (or Picasso Marble)
Metamorphosed Limestone (Calcium Carbonate, CaCO3, with impurities)
Hardness: 3 to 5 (Mohs scale); Color: Base of gray, tan, or green with black or dark brown 'sketch-like' lines; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Irregular break; Specific Gravity: 2.7
- Hardness
- 3 to 5 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 3 to 5 (Mohs scale); Color: Base of gray, tan, or green with black or dark brown 'sketch-like' lines; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Irregular break; Specific Gravity: 2.7
Formation & geological history
Formed from the metamorphism of limestone layers. The dark, organic-looking lines (dendrites) are created by iron and manganese oxides seeping into cracks and fractures within the stone during its formation deep within the Earth's crust.
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (cabochons, beads, rings), decorative carvings, and as a popular specimen for collectors who appreciate its abstract-art appearance.
Geological facts
Despite the name 'Jasper', it is technically a marble (metamorphosed limestone). It is named after the famous artist Pablo Picasso because its crisscrossing lines resemble his abstract cubist paintings.
Field identification & locations
Identify in the field by its distinct 'painted' or 'sketch' appearance and relative softness compared to true jasper (quartz). It is commonly found in Utah, USA. Collectors should look for high-contrast patterns and a smooth, waxy polish finish.
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