metamorphic
Map Jasper (Picasso Stone)
Metamorphosed Calcium Carbonate (Crystalline Limestone or Marble with Silicate inclusions/impurities)
Hardness: 3-5 (Mohs scale); Color: Greys, blacks, and browns in a map-like or painterly pattern; Luster: Vitreous to waxy (when polished); Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 3-5 (Mohs scale)
- Color
- Greys, blacks, and browns in a map-like or painterly pattern
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 3-5 (Mohs scale); Color: Greys, blacks, and browns in a map-like or painterly pattern; Luster: Vitreous to waxy (when polished); Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed deep within the Earth from the transformation of limestone (metamorphism). The characteristic 'veins' are caused by the infiltration of iron, manganese, or oxide minerals during tectonic activity, often associated with the Cenozoic era in specific regions.
Uses & applications
Used primarily for lapidary work, jewelry (beads, cabochons), decorative home decor (spheres, bookends), and as 'worry stones' in metaphysical practices.
Geological facts
Despite being called 'Jasper', it is technically a form of marble/metamorphosed limestone. It is named 'Picasso Stone' because its abstract patterns resemble the brushstrokes of the famous painter Pablo Picasso.
Field identification & locations
Identify in the field by its distinctive 'sketch-like' black lines on a grey or tan base. It is commonly found in the deserts of Utah, USA. Collectors should look for high contrast between the base color and the dark veins.
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