igneous
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
Hardness: 5.5-7 (Mohs scale); Color: Creamy white to pale gray background with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline aggregate; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 5
- Color
- Creamy white to pale gray background with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs scale); Color: Creamy white to pale gray background with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline aggregate; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
An igneous rock primarily composed of feldspar and quartz, with characteristic black spots of arfvedsonite (formerly believed to be tourmaline). It forms from the slow cooling of magma under specific chemical conditions that allow for the distinct spotted texture.
Uses & applications
Primarily used for decorative purposes including jewelry (cabochons, beads), decorative carvings, pocket stones, and architectural accents. It is highly valued in the metaphysical community as a 'grounding stone'.
Geological facts
Despite being called Dalmatian Jasper, it is not actually a jasper (which is a sedimentary chalcedony) but is an igneous rock. The black spots are actually iron-rich crystals of the amphibole arfvedsonite, not tourmaline as often mislabeled.
Field identification & locations
Identify by its distinctive black 'polka dots' on a white-to-tan background. It is primarily sourced from Chihuahua, Mexico. Collectors should look for high contrast between the spots and the matrix and avoid specimens that have been artificially dyed vibrant colors.
