igneous
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
Hardness: 5.5 to 7.0 Mohs; Color: Creamy white or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6 to 2.7.
- Hardness
- 5
- Color
- Creamy white or gray with black-to-brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5 to 7.0 Mohs; Color: Creamy white or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6 to 2.7.
Formation & geological history
Formed through the cooling of silica-rich magma resulting in an igneous rock. It is primarily sourced from Chihuahua, Mexico, and its formation is associated with volcanic activity in the region.
Uses & applications
Commonly used in the jewelry industry for beads, cabochons, and decorative carvings. It is also popular in holistic practices and as a collector's specimen.
Geological facts
Despite being marketed as a 'jasper', it is technically an igneous rock (specifically an aplitic rock) rather than a sedimentary jasper. The black spots are minerals like Arfvedsonite, not tourmaline as often claimed.
Field identification & locations
Identify by its distinctive black 'polka dot' spots on a light gray-white base. It is mostly found in Mexico. Collectors should look for balanced spotting and high-quality polishing.
