igneous
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
Hardness: 5-7.5 (Mohs scale), Color: Creamy white or beige background with black/brown spots, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Specific gravity: 2.58-2.91
- Hardness
- 5-7
Identified More igneous →
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Physical properties
Hardness: 5-7.5 (Mohs scale), Color: Creamy white or beige background with black/brown spots, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Specific gravity: 2.58-2.91
Formation & geological history
Formed by the cooling of volcanic magma. The light matrix is primarily feldspar and quartz, while the distinctive black spots are arfvedsonite (formerly believed to be tourmaline). Found mostly in Chihuahua, Mexico.
Uses & applications
Primarily used in jewelry (beads, cabochons), carvings, decorative ornaments, and widely used in crystal healing and metaphysical practices.
Geological facts
Despite the common trade name 'Dalmatian Jasper', it is not actually a jasper or a sedimentary rock; it is an igneous stone containing complex alkali amphiboles. It is named for the Dalmatian dog breed because of its similar appearance.
Field identification & locations
Identify in the field by its distinct cream background with scattered black-to-dark-blue circular spots. It lacks the typical banding found in many jaspers. Commonly found in large deposits in Mexico.
