Dalmatian Stone (Dalmatian Jasper)

Physical Properties

Hardness: 5.5-7 (Mohs scale); Color: Cream or beige base with black spots; Luster: Vitreous to dull; Crystal structure: Trigonal/Monoclinic (mixed); Specific gravity: ~2.6-2.7

Formation & Geological History

Formed through the cooling of silica-rich magma (igneous). The black spots are needle-like inclusions of the amphibole mineral Arfvedsonite. Most commercial specimens are sourced from Chihuahua, Mexico.

Uses & Applications

Primarily used for lapidary work, jewelry (beads, cabochons), carvings, and as a popular collector's stone due to its unique pattern.

Geological Facts

Despite being called 'jasper' in the trade, it is not a variety of microcrystalline quartz; it is technically an igneous rock primarily composed of quartz and feldspar.

Field Identification & Locations

Identify by its distinct spotted appearance resembling a Dalmatian dog breed. It is exclusively found in Mexico. In the field, look for a fine-grained light matrix with regular dark amphibole inclusions.

Identified on: 4/23/2026

Mode: Standard