igneous
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Aplite (Quartz, Feldspar, and Arfvedsonite composition)
Hardness: 6-7 on Mohs scale. Color: Creamy white or pale gray background with distinct black, brown, or dark spots. Luster: Vitreous to dull (polished specimens are smooth and glossy). Crystal structure: Microcrystalline aggregate. Cleavage: None (conchoidal fracture). Specific gravity: 2.6 - 2.7.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull (polished specimens are smooth and glossy)
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Creamy white or pale gray background with distinct black, brown, or dark spots. Luster: Vitreous to dull (polished specimens are smooth and glossy). Crystal structure: Microcrystalline aggregate. Cleavage: None (conchoidal fracture). Specific gravity: 2.6 - 2.7.
Formation & geological history
Formed from igneous peralkaline aplite rock containing quartz, feldspar, and amphibole minerals like arfvedsonite. As the magma slowly cooled and crystallized, dark spots formed within the light feldspar/quartz matrix.
Uses & applications
Mainly used as a decorative stone, tumbled gemstone for jewelry (beads, cabochons), carvings, pocket stones, and in crystal healing collections.
Geological facts
Despite being widely misnamed as 'Dalmatian Jasper', geological testing has revealed it is not a true chalcedony jasper, but rather a peralkaline aplite rock. Its distinctive spots resemble the coat of a Dalmatian dog.
Field identification & locations
Easily identified by its cream-colored background peppered with distinct dark, rounded spots. It is primarily mined in Chihuahua, Mexico. Collectors appreciate small tumbled stones for their unique pattern.
