igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Hardness: 5.5-7 (Mohs); Color: Creamy white to gray with black or brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7.
- Hardness
- 5
- Color
- Creamy white to gray with black or brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs); Color: Creamy white to gray with black or brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7.
Formation & geological history
Formed by the cooling of magma, specifically peralkaline igneous rocks where the light matrix is composed of quartz and feldspar, while the dark spots are composed of the mineral arfvedsonite. It is primarily found in Chihuahua, Mexico.
Uses & applications
Commonly used in jewelry (beads, cabochons), carvings, decorative ornaments, and metaphysical crystal practices.
Geological facts
Despite its trade name, Dalmatian 'Jasper' is actually an igneous rock rather than a true sedimentary jasper. The black spots are frequently misidentified as tourmaline, but they are actually arfvedsonite crystals.
Field identification & locations
Identified by its distinctive speckled appearance resembling a Dalmatian dog's coat. Collectors should look for a smooth, matte to polished finish and consistent spotting. Found almost exclusively in Mexico.
