igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
Hardness: 5-7 (Mohs); Color: White, cream, or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 5-7 (Mohs)
- Color
- White, cream, or gray with black-to-brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5-7 (Mohs); Color: White, cream, or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Commonly formed from igneous processes where aplitic rock undergoes crystallization. The black spots are typically composed of arfvedsonite or other amphibole minerals embedded in a quartz and feldspar matrix.
Uses & applications
Primarily used for ornamental carvings, jewelry (cabochons and beads), and as a popular stone in crystal healing and metaphysical collections.
Geological facts
Despite its commercial name 'Dalmatian Jasper', it is geologically not a jasper (which is a chalcedony) but an igneous rock consisting mainly of feldspar and quartz. It is named for its resemblance to the Dalmatian dog breed.
Field identification & locations
Identify in the field by its distinct 'polka dot' pattern of black spots on a pale background. It is mostly sourced from Chihuahua, Mexico. It does not react with acid, distinguishing it from look-alike dyed carbonates.
