igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Igneous Rock
Mohs hardness: 5.5 to 7; Color: Creamy white with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
- Hardness
- 5
- Color
- Creamy white with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Mohs hardness: 5.5 to 7; Color: Creamy white with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
Formation & geological history
Formed during volcanic activity where molten magma (rich in silica and alkali metals) cooled and solidified. The black spots are Arfvedsonite crystals that formed within a matrix of quartz and feldspar.
Uses & applications
Primarily used for decorative purposes, jewelry (beads, cabochons), small carvings, and as a popular palm stone for collectors or spiritual practitioners.
Geological facts
Despite its name, it is technically an igneous rock rather than a true chalcedony-based jasper. It is named Dalmatian Jasper because its spotty appearance resembles the coat of a Dalmatian dog breed.
Field identification & locations
Identify by the distinct black arfvedsonite spots on a beige or cream background. It is primarily sourced from Chihuahua, Mexico. Collectors should look for even distribution of spots and smooth polish.
