igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black/dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7
- Hardness
- 5
- Color
- White, cream, or light grey with black/dark brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black/dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7
Formation & geological history
Formed from molten silica and minerals cooling within the Earth's crust; specifically a type of aplite, an igneous rock composed primarily of quartz, feldspar, and the black spots are crystals of the amphibole Arfvedsonite.
Uses & applications
Primarily used for ornamental purposes, gemstone carvings, cabochons for jewelry, and as therapy stones in spiritual or holistic practices.
Geological facts
Despite being called 'Dalmatian Jasper', it is not actually a jasper (which is sedimentary) but an igneous rock. The distinctive black spots were long thought to be tourmaline, but scientific analysis has confirmed they are actually arfvedsonite.
Field identification & locations
Identify in the field by the high contrast 'dog-like' spotting; it is almost exclusively found and mined in Chihuahua, Mexico. Collectors should look for even distribution of spots and a lack of surface cracks.
