igneous
Dalmatian Jasper
Feldspar-Quartz Microgranite
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, creamy white to light beige background with distinct black or dark brown spots composed of tourmaline or arfvedsonite. Vitreous to dull luster with a microgranular crystal structure.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, creamy white to light beige background with distinct black or dark brown spots composed of tourmaline or arfvedsonite. Vitreous to dull luster with a microgranular crystal structure.
Formation & geological history
Formed from cooling magmatic intrusions, specifically microgranite with accessory dark minerals, occurring in ancient volcanic environments.
Uses & applications
Popularly used in lapidary arts for tumbled stones, beads, cabochons, decorative carvings, and crystal healing jewelry.
Geological facts
Despite its trade name 'jasper', it is scientifically not a true jasper (which is microcrystalline quartz) but rather an igneous rock containing quartz and alkali feldspar.
Field identification & locations
Easily identified by its unmistakable spotted 'Dalmatian dog' pattern. Primarily sourced from Chihuahua, Mexico.
