igneous
Dyed Dalmatian Jasper (Dalmatian Stone)
Perthitic Feldspar with Arfvedsonite inclusions
Hardness: 5.5 to 7.0 Mohs; Color: Naturally white with black spots (here dyed bright blue); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.5–2.7
- Hardness
- 5
- Color
- Naturally white with black spots (here dyed bright blue)
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5 to 7.0 Mohs; Color: Naturally white with black spots (here dyed bright blue); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.5–2.7
Formation & geological history
Formed from slow-cooling igneous magma where alkali feldspar and quartz crystallize, capturing tourmaline or arfvedsonite to create the distinct spots. Most specimens originate from Mexico.
Uses & applications
Used primarily in the lapidary arts for beads, cabochons, carvings, and tumbled stones for jewelry and metaphysical collecting.
Geological facts
Despite being called a 'Jasper' in the trade, it is technically an igneous rock composed of feldspar and quartz, not a microcrystalline silicate jasper. The black spots were long thought to be Tourmaline but are actually the amphibole mineral Arfvedsonite.
Field identification & locations
Identify by its 'dalmatian' spot pattern. In this case, the vibrant blue color indicates it has been artificially dyed, a common treatment for this specific stone to increase commercial appeal. Found globally but mostly mined in Chihuahua, Mexico.
