igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline Rock with Feldspar and Arfvedsonite
Mohs hardness: 5.5-7; Color: Creamy white to pale gray with distinct black or brown spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline; Specific gravity: 2.58-2.91.
- Hardness
- 5
- Color
- Creamy white to pale gray with distinct black or brown spots
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Mohs hardness: 5.5-7; Color: Creamy white to pale gray with distinct black or brown spots; Luster: Dull to vitreous; Crystal structure: Microcrystalline; Specific gravity: 2.58-2.91.
Formation & geological history
Formed during volcanic activity, this stone is a mixture of feldspar and quartz with black spots of arfvedsonite (an amphibole mineral). It is found primarily in Chihuahua, Mexico.
Uses & applications
Used almost exclusively for decorative purposes including jewelry (beads, cabochons), carvings, tumbled stones, and as metaphysical healing crystals.
Geological facts
Despite being commonly marketed as 'Dalmation Jasper,' it is actually an igneous rock, not a jasper (sedimentary chalcedony). The black spots were long thought to be tourmaline, but recent studies identified them as arfvedsonite.
Field identification & locations
Identify by the characteristic 'dalmatian' spot pattern. It is rarely found outside of Mexico. Collectors should ensure the base color is natural, as it is frequently dyed bright colors like blue, pink, or purple.
