igneous
Dalmation Jasper
Perthitic Feldspar with Arfvedsonite inclusions
Hardness: 5-7.5 (Mohs); Color: Creamy white to pale gray with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: Good in two directions.
- Hardness
- 5-7
- Color
- Creamy white to pale gray with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5-7.5 (Mohs); Color: Creamy white to pale gray with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: Good in two directions.
Formation & geological history
Formed from cooling magma that crystallized into various feldspars, with darker minerals like Arfvedsonite forming the spots. Primarily found in Chihuahua, Mexico.
Uses & applications
Mostly used for lapidary work including cabochons, beads, carvings, and as a decorative stone in jewelry and metaphysical collections.
Geological facts
Despite being called a 'Jasper', it is geologically an igneous perthitic feldspar rock, not a microcrystalline quartz variety. The black spots are often mistaken for Tourmaline but are actually Arfvedsonite.
Field identification & locations
Identify by its distinctive 'Dalmatian dog' spotted pattern and light background. It is almost exclusively mined in Mexico. Collectors should look for high contrast between the base color and the spots.
