igneous
Dalmatian Jasper (Dalmatian Stone)
Peralkaline Rock with Feldspar and Arfvedsonite
Mohs hardness: 5-7; Color: Pale gray to creamy beige with black spots; Luster: Vitreous to dull; Crystal structure: Phaneritic microcrystalline; Specific gravity: approx 2.6-2.7.
- Hardness
- 5-7
- Color
- Pale gray to creamy beige with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Mohs hardness: 5-7; Color: Pale gray to creamy beige with black spots; Luster: Vitreous to dull; Crystal structure: Phaneritic microcrystalline; Specific gravity: approx 2.6-2.7.
Formation & geological history
Formed by the slow cooling of peralkaline magma, creating a matrix primarily of quartz and feldspar (perthite) with distinct black spots of arfvedsonite or other amphiboles. Most specimens originate from Chihuahua, Mexico.
Uses & applications
Primarily used for decorative purposes, jewelry (beads, cabochons), carved figurines, and as a popular stone in the gemstone and metaphysical market.
Geological facts
Despite the name 'Jasper', it is geologically an igneous rock rather than a variety of microcrystalline quartz. The black spots were long thought to be tourmaline, but are actually arfvedsonite.
Field identification & locations
Identify by its unique 'dog-like' spotted appearance. It is a tuffaceous igneous rock. It is almost exclusively mined in Mexico. Field identification relies on the high contrast between the cream matrix and dark inclusions.
