igneous
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite inclusions
Hardness: 5-7 on Mohs scale; Color: Creamy white or gray background with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7
- Hardness
- 5-7 on Mohs scale
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5-7 on Mohs scale; Color: Creamy white or gray background with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the cooling of silica-rich volcanic lava where the black 'spots' are actually inclusions of a rare amphibole mineral called arfvedsonite, rather than tourmaline as commonly believed. Most specimens come from Chihuahua, Mexico.
Uses & applications
Primarily used for ornamental purposes, including beads, tumbled stones, jewelry cabochons, carvings, and metaphysical therapy stones.
Geological facts
Although often marketed as 'Dalmatian Jasper', it is not a true jasper (sedimentary) but rather an igneous rock. It is named after the Dalmatian dog breed because of its characteristic spotted appearance.
Field identification & locations
Collectors identify it by the distinct, high-contrast black spots on a light matrix. It is exclusively found in Mexico. To identify in the field, look for a lack of transparency and a distinct spotted pattern that doesn't wash off, unlike many dyed stones.
