igneous
Dalmatian Jasper
Microgranular quartz with amphibole/tourmaline inclusions
Hardness: 6.5 to 7 on the Mohs scale; Color: Cream, beige, or grey with distinctive black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None
- Hardness
- 6
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale; Color: Cream, beige, or grey with distinctive black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None
Formation & geological history
Formed from igneous or microgranite intrusive rocks that underwent alteration, where inclusions of black minerals like arfvedsonite or tourmaline created the characteristic spotted pattern.
Uses & applications
Widely used in jewelry making, wire-wrapped pendants, tumbled stones, and decorative carvings.
Geological facts
Despite its trade name 'Dalmatian Jasper', gemologists and geologists classify it more accurately as a microgranite or feldspar-quartz rock rather than true jasper, because it does not consist primarily of chalcedony.
Field identification & locations
Easily identifiable by its cream-colored background speckled with distinct black spots resembling a Dalmatian dog. Primarily sourced in Mexico.
