Dalmatian Stone

Physical Properties

Hardness: 5.5-7 (Mohs scale); Color: Pale gray, cream, or beige base with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None

Formation & Geological History

Formed from the slow cooling of silica-rich peralkaline rhyolite magma, which allows for some crystal grouping. The dark spots are typically crystals of arfvedsonite or other amphiboles.

Uses & Applications

Primarily used for decorative carvings, cabochons, metaphysical beads, jewelry, and ornamental animal figurines.

Geological Facts

Despite being marketed as 'Jasper' for years, scientific analysis shows it is an igneous rock (rhyolite), not a sedimentary jasper. The black spots are not tourmaline as often claimed, but rather the mineral arfvedsonite.

Field Identification & Locations

Identify by its unique 'spotted' appearance resembling a Dalmatian dog. Found predominantly in Chihuahua, Mexico. Collectors should look for even distribution of spots and high-quality polish.

Identified on: 4/28/2026

Mode: Standard