igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Hardness: 5.5-7 (Mohs); Color: Creamy white to gray with black spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58-2.91
- Hardness
- 5
- Color
- Creamy white to gray with black 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 spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58-2.91
Formation & geological history
Formed during igneous processes where magma cools to form a felsic rock. It typically originates from Chihuahua, Mexico. It is not a true 'jasper' (which is sedimentary) but rather an igneous rock containing quartz and feldspars.
Uses & applications
Primarily used in jewelry for beads, cabochons, and carvings, as well as in the metaphysical stone trade for its decorative 'dalmatian' dog-like appearance.
Geological facts
It is a common misnomer to call it jasper; it is technically an igneous rock. The black spots are not tourmaline as often believed, but are actually the amphibole mineral arfvedsonite.
Field identification & locations
Identify by its distinct black-on-white/cream spotted pattern which resembles a Dalmatian dog. Primarily found in Mexico. Collectors should look for even distribution of spots and a smooth polish.
