igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or tan base with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58 - 2.91
- Hardness
- 5
- Color
- Creamy white or tan base with black or dark brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or tan base with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58 - 2.91
Formation & geological history
Formed through volcanic activity where magma cools and igneous material solidifies. The distinct spots are typically inclusions of the mineral Arfvedsonite. It is primarily found in Mexico.
Uses & applications
Predominantly used for ornamental purposes including carvings (like the dinosaur skull pictured), spheres, tumbled stones, and cabochons for jewelry. It is a popular 'healing stone' in metaphysical circles.
Geological facts
Despite being called 'Jasper', it is technically an igneous rock rather than a sedimentary chalcedony. The black spots are often mistaken for Tourmaline, but are chemically arfvedsonite, a sodium amphibole mineral.
Field identification & locations
Identify by its unique 'dalmatian dog' pattern of black spots on a cream base. In the field, look for lack of transparency and a smooth, waxy feel when polished. Most commercial specimens originate from Chihuahua, Mexico.
