igneous
Dalmatian Jasper
Peralkaline Feldspar Diorite/Rhyolite
Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black spots; Luster: Dull/Greasy to Vitreous; Crystal structure: Microcrystalline; Specific gravity: Approx. 2.6
- Hardness
- 5
- Color
- White, cream, or light grey with black spots
- Luster
- Dull/Greasy to Vitreous
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black spots; Luster: Dull/Greasy to Vitreous; Crystal structure: Microcrystalline; Specific gravity: Approx. 2.6
Formation & geological history
Formed primarily from the cooling of magma in volcanic regions, specifically in Chihuahua, Mexico. It is an igneous rock where specific minerals create a speckled appearance through chemical cooling processes.
Uses & applications
Used extensively in lapidary work for cabochons, beads, decorative carvings, and metaphysical jewelry. It is also a popular tumbled stone for collectors.
Geological facts
Despite being traded as 'Jasper', it is actually an igneous rock. The black spots were long thought to be Tourmaline but are actually Arfvedsonite, a sodium amphibole mineral.
Field identification & locations
Identified by its distinctive black spots on a cream-colored matrix. To identify, look for the 'Dalmatian dog' pattern and its typical resistance to scratching from steel. It is almost exclusively found in Mexico.
