igneous
Dalmatian Stone
Peralkaline rhyolite
Hardness: 5.5 to 7.0 (Mohs scale); Color: Pale gray, cream, or white with black/brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6–2.7
- Hardness
- 5
- Color
- Pale gray, cream, or white with black/brown spots
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 5.5 to 7.0 (Mohs scale); Color: Pale gray, cream, or white with black/brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6–2.7
Formation & geological history
Formed through the cooling of silica-rich magma that breached the Earth's surface. The black spots are typically composed of arfvedsonite or other sodic amphiboles. It is primarily found in Chihuahua, Mexico.
Uses & applications
Commonly used for lapidary work, including cabochons, beads, decorative carvings, and sphere-shaped ornaments. It is popular in metaphysical circles as a 'grounding' stone.
Geological facts
Despite often being called 'Dalmatian Jasper', it is not actually a jasper (which is sedimentary). It is an igneous rock specifically categorized as a peralkaline rhyolite.
Field identification & locations
Identify by the distinctive 'dog-like' spotted pattern against a cream background. It takes a high polish and is cool to the touch. It is found exclusively in Mexico.
