igneous
Dalmatian Stone
Dalmatian Stone (a variety of aplite)
Hardness: 6-7 (Mohs scale), Color: Creamy white or light gray with black to dark brown spots, Luster: Dull to vitreous, Crystal Structure: Phaneritic (fine-grained), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Creamy white or light gray with black to dark brown spots, Luster: Dull to vitreous, Crystal Structure: Phaneritic (fine-grained), Specific Gravity: 2.6-2.7
Formation & geological history
Formed from cooling of silica-rich magma (igneous). The unique spots are inclusions of arfvedsonite or other amphiboles within a matrix of quartz and feldspar. Most specimens date from the Mesozoic era.
Uses & applications
Primarily used in jewelry for beads, cabochons, and carvings; also popular in metaphysical practices as a gemstone.
Geological facts
It is often incorrectly called 'Dalmatian Jasper', but it is actually a type of igneous rock (aplite) rather than a sedimentary jasper. The black spots are minerals from the amphibole group, not tourmaline as often claimed.
Field identification & locations
Identify by its distinctive polka-dot pattern. It is almost exclusively found in Chihuahua, Mexico. Collectors should look for a uniform distribution of spots and no visible cracks.
