igneous
Dalmatian Jasper
Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)
Hardness of 6-7 on the Mohs scale. Colors include cream, beige, or grey with distinctive black or dark brown spots. Luster is vitreous to dull when polished. Crystal structure is microcrystalline/trigonal for quartz and triclinic for feldspar.
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Physical properties
Hardness of 6-7 on the Mohs scale. Colors include cream, beige, or grey with distinctive black or dark brown spots. Luster is vitreous to dull when polished. Crystal structure is microcrystalline/trigonal for quartz and triclinic for feldspar.
Formation & geological history
Formed from igneous processes, specifically as a microgranite or feldspar porphyry intrusion that cooled beneath the Earth's crust, with dark mineral inclusions.
Uses & applications
Used primarily for polished cabochons, beads, ornamental carvings, and holistic crystal healing practices.
Geological facts
Despite its trade name 'jasper', geologists classify Dalmatian Jasper as an igneous rock rather than a true microcrystalline quartz chalcedony. The spots are typically composed of the amphibole mineral arfvedsonite.
Field identification & locations
Easily identified by its distinct spotted appearance resembling a Dalmatian dog. Primarily sourced from Chihuahua, Mexico.
