igneous
Dalmatian Stone
Dalmatian Jasper (actually a Peralkaline Igneous Rock)
Hardness: 5.5-7 (Mohs); Color: Pale gray/white/cream background with black-to-brown spots; Luster: Dull to Vitreous/Polished; Structure: Microcrystalline; Specific Gravity: Approx 2.6
- Hardness
- 5
- Color
- Pale gray/white/cream background with black-to-brown spots
- Luster
- Dull to Vitreous/Polished
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs); Color: Pale gray/white/cream background with black-to-brown spots; Luster: Dull to Vitreous/Polished; Structure: Microcrystalline; Specific Gravity: Approx 2.6
Formation & geological history
Formed through volcanic activity where cooling magma creates a peralkaline rock primarily composed of feldspar and quartz, with spots formed by needle-like crystals of arfvedsonite or other amphiboles.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and 'healing stone' metaphysical collections. Also popular as worry stones or for desktop decoration.
Geological facts
Despite being called 'Dalmatian Jasper' in the trade, it is not actually a jasper (which is sedimentary) but an igneous rock. The black spots are often mistaken for tourmaline, but are usually iron-rich arfvedsonite.
Field identification & locations
Identify by its distinctive 'dog-like' spotted pattern. It is almost exclusively mined in Chihuahua, Mexico. Collectors should look for a smooth, high-polish finish without fractures.
