igneous
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
Hardness: 5.5-7 (Mohs); Color: Creamy white or gray background with black or dark brown spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline aggregate; Cleavage: None visible in hand specimen
- Hardness
- 5
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs); Color: Creamy white or gray background with black or dark brown spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline aggregate; Cleavage: None visible in hand specimen
Formation & geological history
An igneous rock formed from slowly cooling magma where black spots were created by inclusions of iron-rich minerals like arfvedsonite or tourmaline. This specific specimen appears to be a weathered cobble from Chihuahua, Mexico.
Uses & applications
Used primarily for lapidary work, jewelry (beads and cabochons), carvings, and as a popular stone for collectors and metaphysical enthusiasts.
Geological facts
Often marketed as 'Dalmatian Jasper', it is not actually a jasper (which is sedimentary) but an igneous rock. The black spots are frequently misidentified as tourmaline, but scientific analysis often identifies them as arfvedsonite.
Field identification & locations
Identify by its distinctive black spotted pattern reminiscent of a Dalmatian dog. Found almost exclusively in Chihuahua, Mexico. Collectors should look for specimens without cracks or artificial dyes.
