igneous
Dalmatian jasper
Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions
AI-generated identification · may be incorrectCream to pale beige rounded stone with black spots; opaque, fine-grained, vitreous to waxy luster, no visible cleavage, and approximately Mohs 6–7 hardness. The pictured piece appears polished or tumbled.
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Physical properties
Cream to pale beige rounded stone with black spots; opaque, fine-grained, vitreous to waxy luster, no visible cleavage, and approximately Mohs 6–7 hardness. The pictured piece appears polished or tumbled.
Formation & geological history
Usually quarried in Chihuahua, Mexico, from Permian–Triassic volcanic or subvolcanic rocks; it formed as silica-rich magma cooled and dark amphibole/pyroxene minerals crystallized within it. “Jasper” is a lapidary trade name rather than a strict mineral classification.
Uses & applications
Used for cabochons, beads, carvings, polished stones, and decorative objects; it is generally unsuitable for major construction because it is sold as a lapidary material.
Geological facts
The characteristic spots resemble a Dalmatian dog’s coat, giving the material its commercial name. Despite common labeling as jasper, many specimens are not true quartz-rich jasper.
Field identification & locations
Identify it by the cream matrix, sharply contrasting irregular black spots, and polished appearance; distinguish it from dalmatian jasper imitations by its natural, non-painted inclusions. Commonly found in Mexico and lapidary shops worldwide.
