Dalmatian Jasper

Physical Properties

Hardness: 5.5-7 (Mohs); Color: Pale grey, cream, or beige with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.5-2.7

Formation & Geological History

Formed through the cooling of silica-rich volcanic magma (rhyolite). The dark spots are actually inclusions of the mineral arfvedsonite, not tourmaline as often mistakenly claimed.

Uses & Applications

Primarily used for lapidary work, jewelry making (cabochons, beads), decorative carvings, and metaphysical/collecting purposes.

Geological Facts

Despite being called a 'Jasper', it is technically an igneous rock (rhyolite). It is named after the Dalmatian dog breed because of its distinct black-on-white spotted appearance.

Field Identification & Locations

Identify in the field by its distinct cream background and rounded black spots. It does not react to acid and is found almost exclusively in Chihuahua, Mexico.

Identified on: 4/23/2026

Mode: Standard