igneous
Dalmatian Jasper (Dyed Blue)
Peralkaline Rock with Arfvedsonite and Blue Dye
Hardness: 5.5-7 (Mohs scale), Color: Dyed Blue with natural black spots, Luster: Vitreous to dull when unpolished, Crystal structure: Microcrystalline, Cleavage: None, Specific gravity: 2.6-2.7
- Hardness
- 5
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Physical properties
Hardness: 5.5-7 (Mohs scale), Color: Dyed Blue with natural black spots, Luster: Vitreous to dull when unpolished, Crystal structure: Microcrystalline, Cleavage: None, Specific gravity: 2.6-2.7
Formation & geological history
Formed from peralkaline igneous activity where magma cools and crystallizes. The black spots are Arfvedsonite (amphibole), not Tourmaline as often misclaimed. Most specimens originate from Chihuahua, Mexico. These specific specimens have been artificially dyed blue.
Uses & applications
Primarily used for decorative purposes, lapidary carvings, tumbled stones, and costume jewelry. It is a popular stone in metaphysical circles and for beginner rock collections.
Geological facts
Despite its trade name 'Dalmatian Jasper', it is not actually a jasper (sedimentary) but an igneous rock. The blue color seen in this image is 100% artificial, as the natural stone is white to cream-colored.
Field identification & locations
Identify by the distinct 'Dalmatian' spotting pattern of black crystals against a lighter matrix. If found in blue as shown here, it is a clear indicator of dyeing. Natural stones are primarily found in Mexico.
