igneous
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Hardness: 5-7 (Mohs); Color: White to cream background with black spots; Luster: Vitreous; Crystal Structure: Monoclinic/Hexagonal components (microcrystalline); Specific Gravity: 2.58-2.91
- Hardness
- 5-7 (Mohs)
- Color
- White to cream background with black spots
- Luster
- Vitreous
Identified More igneous →
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Physical properties
Hardness: 5-7 (Mohs); Color: White to cream background with black spots; Luster: Vitreous; Crystal Structure: Monoclinic/Hexagonal components (microcrystalline); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from slow-cooling igneous magma, allowing the growth of distinct mineral clusters. The white base is primarily feldspar and quartz, while the black spots are crystals of arfvedsonite (a sodic amphibole).
Uses & applications
Primarily used for ornamental carvings, beads, cabochons for jewelry, and as a popular specimen for crystal healing and mineral collecting.
Geological facts
Despite its common trade name 'Dalmatian Jasper', it is NOT a true jasper (sedimentary) but rather an igneous rock. The black spots were long thought to be tourmaline before chemical analysis identified them as arfvedsonite.
Field identification & locations
Identify by its unique 'dog coat' pattern. It is almost exclusively found in Chihuahua, Mexico. Collectors should look for a smooth, matte to polished finish and consistent spotting.
