sedimentary
Picasso Jasper (Picasso Stone)
Metamorphosed Calcium Carbonate (Silicified Limestone)
Hardness: 6.5 to 7 (Mohs scale); Color: Shades of grey, black, and tan with vein-like patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Specific Gravity: 2.58 to 2.91
- Hardness
- 6
- Color
- Shades of grey, black, and tan with vein-like patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5 to 7 (Mohs scale); Color: Shades of grey, black, and tan with vein-like patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Specific Gravity: 2.58 to 2.91
Formation & geological history
Formed from the recrystallization of limestone deep within the Earth's crust. Heat and pressure caused the original sedimentary rock to undergo a low-grade metamorphic process, while iron oxides created the characteristic 'abstract painting' veins.
Uses & applications
Primarily used as a decorative stone in jewelry (beads, cabochons), carving, and meditation practices (worry stones).
Geological facts
Despite being called a 'Jasper', it is geologically a metamorphosed limestone. It is named after the artist Pablo Picasso because its unique patterns resemble his abstract painting style.
Field identification & locations
Identify by its distinctive criss-crossing black lines over a grey background. It is mostly found in Utah, USA. For collectors, look for high-contrast patterns and a smooth, waxy polish.
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