igneous
Dalmatian Jasper
Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)
Hardness: 5.5-7 on Mohs scale; Color: Creamy white to grayish-beige with distinct black spots; Luster: Dull to vitreous (pearly when polished); Crystal Structure: Trigonal/Amorphous; Specific Gravity: 2.58-2.91
- Hardness
- 5
- Color
- Creamy white to grayish-beige with distinct black spots
- Luster
- Dull to vitreous (pearly when polished)
Identified More igneous →
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Physical properties
Hardness: 5.5-7 on Mohs scale; Color: Creamy white to grayish-beige with distinct black spots; Luster: Dull to vitreous (pearly when polished); Crystal Structure: Trigonal/Amorphous; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the solidification of magma, typically resulting in a microcrystalline quartz base with inclusions of black amphibole minerals (Arfvedsonite). It is primarily an intrusive igneous rock despite its common 'Jasper' trade name.
Uses & applications
Mainly used in jewelry as cabochons, beads, and tumbled stones. Also used for ornamental carvings, spheres, and metaphysical practices.
Geological facts
Despite its trade name, Dalmatian Stone is not a true Jasper (which is sedimentary) but is actually an igneous rock. The black spots were long thought to be Tourmaline but have been identified as the mineral Arfvedsonite.
Field identification & locations
Identify by its unique 'dog-coat' pattern of black spots on a pale background. It is almost exclusively mined in Chihuahua, Mexico. Collectors look for high contrast between the cream background and the dark spots.
