igneous
Dalmatian jasper (often sold as Dalmatian stone)
Quartz-bearing microgranular felsic rock, commonly an altered rhyolite or related volcanic rock with black aegirine/arfvedsonite-group inclusions
AI-generated identification · may be incorrectCream-white, fine-grained matrix with rounded black spots and a polished surface; typically Mohs 6–7, opaque, with a dull to slightly vitreous luster and no visible cleavage. The black inclusions are iron-rich amphibole or pyroxene-group minerals, though exact identification requires analysis.
Identified More igneous →
Explore Dalmatian jasper (often sold as Dalmatian stone) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Cream-white, fine-grained matrix with rounded black spots and a polished surface; typically Mohs 6–7, opaque, with a dull to slightly vitreous luster and no visible cleavage. The black inclusions are iron-rich amphibole or pyroxene-group minerals, though exact identification requires analysis.
Formation & geological history
Most commercial material comes from Chihuahua, Mexico, formed by volcanic activity and later alteration; its precise geological age varies by deposit. It is commonly cut and tumbled for ornamental use.
Uses & applications
Used for cabochons, beads, carvings, tumbled stones, and decorative objects; it is more ornamental than fine-jewelry grade. Common pieces generally have modest collector value.
Geological facts
Despite its name, it is not true jasper in the strict mineralogical sense and is not related to Dalmatian dogs; “Dalmatian stone” is a trade name.
Field identification & locations
Identify it by the cream base and distinctive black spots, relatively high hardness, and opaque volcanic texture; test cautiously because polished surfaces can mask grain. Commonly found in Mexican lapidary material.
