igneous
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
Hardness: 5.5-7 (Mohs scale); Color: Creamy grey-beige with black spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline aggregate; Cleavage: None; Specific gravity: 2.5-2.7
- Hardness
- 5
- Color
- Creamy grey-beige with black spots
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs scale); Color: Creamy grey-beige with black spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline aggregate; Cleavage: None; Specific gravity: 2.5-2.7
Formation & geological history
Formed from the solidification of silica-rich magma containing alkaline minerals. The black spots are specifically inclusions of Arfvedsonite (an amphibole mineral) within a feldspar/quartz matrix. Most specimens are found in Chihuahua, Mexico.
Uses & applications
Primarily used for ornamental purposes, including lapidary work, cabochons, beads, and decorative carvings. It is also a popular stone in the metaphysical and gemstone collecting community.
Geological facts
Commonly mislabeled as 'Dalmatian Jasper', it is not actually a jasper (sedimentary) but an igneous rock. The signature black spots were long thought to be tourmaline, but chemical analysis confirmed they are actually the rare amphibole mineral Arfvedsonite.
Field identification & locations
Identify by its unique 'dog-coat' pattern and lack of grain. Collectors look for sharp contrast between the light background and dark spots. It is almost exclusively sourced from Mexico and is easily identified by its lack of transparency and distinctive spotting.
