igneous
Dalmatian Jasper (Dalmatian Stone)
Perthitic feldspar with Arfvedsonite inclusions
Hardness: 5-7 (Mohs scale); Color: Creamy white or gray background with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: None visible in aggregate form.
- Hardness
- 5-7 (Mohs scale)
- Color
- Creamy white or gray background with black spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5-7 (Mohs scale); Color: Creamy white or gray background with black spots; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: None visible in aggregate form.
Formation & geological history
Formed from igneous activity where magma cools and solidifies; the 'spots' are amphibole minerals like arfvedsonite or tourmaline cooling within a feldspar/quartz matrix. Primarily dated to the Mesozoic or Cenozoic eras depending on specific locality.
Uses & applications
Used primarily for lapidary work including beads, cabochons, tumbled stones, and decorative carvings. It is also a popular stone in the metaphysical and gemstone collecting communities.
Geological facts
Despite being called 'Jasper', it is technically an igneous rock (perthite) and not a true microcrystalline quartz jasper. It is named after the Dalmatian dog breed because of its distinctive spotted appearance.
Field identification & locations
Identify by its cream-colored background and distinct, well-defined black circular spots. Found almost exclusively in Chihuahua, Mexico. Look for a smooth, porcelain-like texture when polished.
