metamorphic
Picasso Jasper (also known as Picasso Marble)
Metamorphosed Limestone (Calcium Carbonate with impurities)
Hardness: 3-5 on Mohs scale; Color: Grey, black, tan, and brown with 'brush stroke' patterns; Luster: Sub-vitreous to earthy (often polished); Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal.
- Hardness
- 3-5 on Mohs scale
- Color
- Grey, black, tan, and brown with 'brush stroke' patterns
- Luster
- Sub-vitreous to earthy (often polished)
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Physical properties
Hardness: 3-5 on Mohs scale; Color: Grey, black, tan, and brown with 'brush stroke' patterns; Luster: Sub-vitreous to earthy (often polished); Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal.
Formation & geological history
Picasso Jasper is a metamorphosed limestone that formed deep within the Earth through heat and pressure. The characteristic 'veins' or 'lines' are caused by iron oxides and other mineral impurities that seeped into cracks as the rock formed, creating the scenic pattern.
Uses & applications
Primarily used for lapidary purposes including jewelry (beads, cabochons), carvings, decorative ornaments, and metaphysical 'grounding' stones.
Geological facts
Despite being called a 'Jasper', it is geologically a marble (metamorphosed limestone). It is named after the artist Pablo Picasso because the patterns resemble his abstract painting style.
Field identification & locations
Identify by its distinctive criss-crossing dark lines on a muted grey or tan background. It is commonly found in Utah, USA. In the field, look for a fine-grained, heavy rock that takes a very high polish.
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