igneous
Dalmation Stone
Peralkaline Rock (Microcline Quartz mixture with Arfvedsonite)
Hardness: 5-7.5 (Mohs scale); Color: Cream or beige base with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic/Orthorhombic components; Specific gravity: approx. 2.6-2.8.
- Hardness
- 5-7
- Color
- Cream or beige base with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5-7.5 (Mohs scale); Color: Cream or beige base with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic/Orthorhombic components; Specific gravity: approx. 2.6-2.8.
Formation & geological history
Formed from volcanic activity when tectonic plate movement causes cooling of peralkaline lava. The black spots are minerals from the amphibole group, primarily arfvedsonite, cooling rapidly within a matrix of quartz and feldspar.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons, beads, and tumbled stones, and widely in the gemstone and metaphysical collector markets.
Geological facts
Often incorrectly marketed as Dalmatian Jasper, it is actually an igneous rock rather than a sedimentary jasper. The black spots are not tourmaline as frequently misidentified, but are actually Arfvedsonite.
Field identification & locations
Identified by its distinctive black-spotted pattern on a cream-to-tan background. Commonly found in Chihuahua, Mexico. Collectors should look for the characteristic granular igneous texture rather than the smooth chalcedony texture of true jasper.
