igneous
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, creamy white to beige color with characteristic black or dark brown spots, vitreous to dull luster, and microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, creamy white to beige color with characteristic black or dark brown spots, vitreous to dull luster, and microcrystalline structure.
Formation & geological history
Formed as an igneous rock, specifically an altered microgranite or aplite, with black spots composed of amphibole minerals like arfvedsonite.
Uses & applications
Primarily used for lapidary arts, tumbled stones, beaded jewelry, and ornamental carvings.
Geological facts
Despite its trade name 'jasper', it is scientifically a microgranite rather than a true jasper due to its primary feldspar and quartz igneous composition.
Field identification & locations
Easily identified visually by its striking white and black spotted Dalmatian-dog appearance. Commonly sourced from Chihuahua, Mexico.
