igneous
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Feldsphathic Igneous Rock
Hardness: 5.5 to 7.0 on Mohs scale; Color: Cream, white, or light gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Largely microcrystalline; Specific gravity: approx 2.6 - 2.8.
- Hardness
- 5
- Color
- Cream, white, or light gray with black-to-brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5 to 7.0 on Mohs scale; Color: Cream, white, or light gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Largely microcrystalline; Specific gravity: approx 2.6 - 2.8.
Formation & geological history
Formed through the cooling of silica-rich magma; the black spots are crystals of the rare alkali amphibole Arfvedsonite. It is primarily sourced from Chihuahua, Mexico.
Uses & applications
Used extensively in the jewelry industry for beads, cabochons, and carvings. Also popular in the metaphysical community and as a decorative stone/collector specimen.
Geological facts
Despite being called 'Dalmatian Jasper' in the trade, it is technically an igneous rock rather than a true sedimentary jasper because it contains feldspar and quartz alongside the arfvedsonite inclusions.
Field identification & locations
Identify by its distinctive black 'polka dot' spots on a light background. It is mostly found in Mexico. To distinguish from fakes, check for the characteristic 'needle' texture of the black spots under magnification.
