Dalmatian Jasper / Dalmatian Stone

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Pale gray or cream with black or brown spots; Luster: Vitreous to waxy; Texture: Fine-grained with discrete inclusions.

Formation & Geological History

Formed from the slow cooling of magma within the Earth's crust, primarily composed of feldspar and quartz with black needle-like arfvedsonite crystals. It is typically found in Chihuahua, Mexico.

Uses & Applications

Used extensively in the lapidary arts for beads, pendants, cabochons, and decorative spheres/carvings due to its durability and unique pattern.

Geological Facts

Despite being marketed as 'Jasper' (a sedimentary rock), geological analysis shows it is an igneous rock. The black spots are minerals like arfvedsonite or other amphiboles, not tourmaline as often mislabeled.

Field Identification & Locations

Identify in the field by its distinct 'dalmatian dog' spotted pattern. It is almost exclusively mined in Mexico. Collectors should look for high contrast between the background and the spots.

Identified on: 4/15/2026

Mode: Standard