igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Mohs hardness: 5-7.5; Color: Cream to white with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Amorphous; Specific gravity: 2.6-2.7
- Hardness
- 5-7
- Color
- Cream to white with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Mohs hardness: 5-7.5; Color: Cream to white with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Amorphous; Specific gravity: 2.6-2.7
Formation & geological history
Dalmatian jasper is an igneous rock formed from the cooling of silica-rich magma near the Earth's surface. Its characteristic spots are composed of arfvedsonite or other amphiboles embedded in a matrix of quartz and feldspar.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), carvings, and as a popular tumbling stone for collectors and metaphysical practitioners.
Geological facts
Despite its trade name, it is not actually a jasper (which is a sedimentary chalcedony) but is instead a peralkaline volcanic rock. It is named after the Dalmatian dog breed because of its similar spotted appearance.
Field identification & locations
Identified by its distinctive black tourmaline or arfvedsonite spots on a light-colored background. Most commercial supply originates from Chihuahua, Mexico. It is easily recognized in the field by its unique high-contrast speckled pattern.
