igneous
Dalmatian jasper
Quartz-bearing alkali feldspar syenite/porphyritic igneous rock, commonly marketed as Dalmatian jasper
AI-generated identification · may be incorrectPolished/tumbled, cream to beige matrix with black rounded spots; typically feldspar, quartz, and dark aegirine or arfvedsonite. Mohs hardness about 6–7, opaque, with a dull to vitreous luster and no obvious cleavage on the polished surface.
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Physical properties
Polished/tumbled, cream to beige matrix with black rounded spots; typically feldspar, quartz, and dark aegirine or arfvedsonite. Mohs hardness about 6–7, opaque, with a dull to vitreous luster and no obvious cleavage on the polished surface.
Formation & geological history
An alkaline igneous rock formed when silica-poor magma cooled slowly underground, allowing feldspar-rich material and dark mineral inclusions to develop; commercial material is chiefly from Mexico. It is geologically young relative to many continental rocks, commonly Cenozoic in age.
Uses & applications
Used for cabochons, beads, carvings, decorative stones, and metaphysical collectibles; it has little industrial or construction use.
Geological facts
The spots are natural dark mineral aggregates, not animal markings; the trade name “jasper” is technically misleading because much Dalmatian stone is an igneous rock rather than microcrystalline quartz.
Field identification & locations
Identify it by its distinctive black-on-cream pattern, moderate hardness, and opaque polished surface; test cautiously because dyed imitations and spotted ceramics exist. Commonly sold from Chihuahua, Mexico.
