igneous
Dalmatian Jasper
Dalmatian Stone (not a true Jasper, primarily a Perthitic Feldspar with Arfvedsonite)
Hardness: 5.5-7 (Mohs); Color: White to cream background with distinct black or dark green circular spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Specific gravity: 2.6-2.7.
- Hardness
- 5
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs); Color: White to cream background with distinct black or dark green circular spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Specific gravity: 2.6-2.7.
Formation & geological history
This igneous rock forms from molten magma that cools slowly, typically under the Earth's surface. It is primarily composed of feldspar and quartz, with characteristic black spots formed by the mineral arfvedsonite. It is mostly found in Chihuahua, Mexico.
Uses & applications
Primarily used in the lapidary industry for making cabochons, beads, decorative carvings, and tumble-polished stones. It is also a popular specimen for crystal healing and mineral collectors.
Geological facts
While commonly called 'Dalmatian Jasper', it is not actually a jasper (which is a form of microcrystalline quartz). It is a perthitic rock. The black spots are often misidentified as tourmaline, but chemical analysis shows they are actually arfvedsonite.
Field identification & locations
Identified by its resemblance to the Dalmatian dog breed. It is relatively easy to find in metaphysical shops and gem shows. To identify in the field, look for the cream base and needle-like amphibole inclusions forming the spots.
