igneous
Dalmatian Jasper
Peralkalic Quartz-Feldspar Porphyry
Hardness: 5.5-7 (Mohs scale); 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 scale); 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 during volcanic activity where magma cooled slowly, allowing black arfvedsonite crystals to form within a peralkalic quartz-feldspar matrix. Primarily found in Chihuahua, Mexico.
Uses & applications
Commonly used for lapidary work, jewelry (tumbled stones, beads, cabochons), and metaphysical practices as a grounding stone.
Geological facts
Despite being marketed as a 'Jasper' (which is sedimentary), scientific analysis shows it is actually an igneous rock composed of feldspar and quartz with black tourmaline-like arfvedsonite spots.
Field identification & locations
Identify by its distinct Dalmatian dog-like pattern of black spots on a light gray or beige background. It is a tuffaceous rock often found in arid volcanic regions.
