igneous
Dalmatian Stone
Dalmatian Jasper (Aplite rock composition)
Hardness 5.5 to 7 on Mohs scale. Creamy off-white to pale gray base matrix with distinct, rounded black or dark brown spots composed primarily of arfvedsonite/tourmaline. Vitreous to dull luster when polished.
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Physical properties
Hardness 5.5 to 7 on Mohs scale. Creamy off-white to pale gray base matrix with distinct, rounded black or dark brown spots composed primarily of arfvedsonite/tourmaline. Vitreous to dull luster when polished.
Formation & geological history
Formed as an igneous rock, specifically a fine-grained felsic vein rock known as aplite. The black spots develop as rare amphibole minerals grow during slow crystallization phases within the felsic magma.
Uses & applications
Popularly used for lapidary arts, jewelry (beads, cabochons), tumbled stones, carvings, and ornamental decorative pieces.
Geological facts
Although commonly sold under the trade name 'Dalmatian Jasper', it is technically not a true chalcedony jasper, but rather a microcrystalline igneous aplite rock with tourmaline or arfvedsonite inclusions.
Field identification & locations
Identified by its distinctive speckled appearance resembling a Dalmatian dog coat. Mostly mined in Chihuahua, Mexico.
