igneous
Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
Hardness: 6.5 - 7 (Mohs); Color: Pale gray, tan, or beige with black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- Pale gray, tan, or beige with black/brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6.5 - 7 (Mohs); Color: Pale gray, tan, or beige with black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed through the cooling of silica-rich magma that has been enriched with alkali metals. The black spots are needle-like inclusions of Arfvedsonite (amphibole). Primarily found in Chihuahua, Mexico.
Uses & applications
Mostly used for lapidary work, jewelry (beads, cabochons), tumbled stones for collectors, and in the metaphysical community as a grounding stone.
Geological facts
Despite being called 'Dalmatian Jasper' in the trade, it is technically an igneous rock, not a true jasper (sedimentary). The black spots were long thought to be Tourmaline, but scientific analysis has proven them to be the mineral Arfvedsonite.
Field identification & locations
Identify by its unique 'dog coat' pattern of black spots on a light tan/creamy base. It is common at gem shows and specialty shops. It won't react with acid and cannot be scratched by a steel knife.
