igneous
Dalmatian Stone
Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)
Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or pale gray with distinct black or brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: Approx 2.6 - 3.0
- Hardness
- 5
- Color
- Creamy white or pale gray with distinct black or brown spots
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or pale gray with distinct black or brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: Approx 2.6 - 3.0
Formation & geological history
Formed through the cooling of molten rock (magma) within the Earth's crust, primarily found in Chihuahua, Mexico. The distinct spots are composed of the mineral Arfvedsonite within a matrix of alkali feldspars.
Uses & applications
Primarily used for lapidary items, tumbled stones, beads, jewelry, and metaphysical sculptures (cabochons and spheres). Known for its durability and ease of polishing.
Geological facts
Commonly mislabeled as 'Dalmatian Jasper', it is actually a rock rather than a jasper (which is a form of chalcedony). The black spots were long thought to be tourmaline, but recent chemical analysis identifies them as arfvedsonite.
Field identification & locations
Identify by its 'dogs-ear' off-white background and sharp, scattered black inclusions. It is most commonly found in Mexico. Collectors should look for a smooth finish and high contrast between the base color and the spots.
