igneous
Dalmatian jasper (often sold as Dalmatian stone)
Porphyritic alkali feldspar–quartz syenite, commonly with black arfvedsonite/aegirine-group amphibole inclusions
AI-generated identification · may be incorrectCream to white, opaque, with irregular black spots; fine-grained to porphyritic texture and dull-to-waxy luster. Hardness is approximately 6–7 Mohs; cleavage is not obvious in a tumbled piece, and specific gravity is roughly 2.6–2.8.
Identified More igneous →
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Physical properties
Cream to white, opaque, with irregular black spots; fine-grained to porphyritic texture and dull-to-waxy luster. Hardness is approximately 6–7 Mohs; cleavage is not obvious in a tumbled piece, and specific gravity is roughly 2.6–2.8.
Formation & geological history
A relatively young alkaline igneous rock, generally interpreted as an altered or hydrothermally affected syenitic rock; commercial material is famously associated with Chihuahua, Mexico. Exact geological age depends on the quarry, commonly Cenozoic.
Uses & applications
Used for tumbled stones, cabochons, beads, carvings, and decorative objects; it has little architectural or industrial use. Collector value is modest and mainly determined by pattern, polish, and size.
Geological facts
The name is commercial rather than a strict formal rock classification, and it is not true jasper in the mineralogical sense. Black inclusions create the characteristic Dalmatian-like spotting.
Field identification & locations
Identify it by its ivory base, randomly distributed black inclusions, and relatively hard, durable polished surface; distinguish it from spotted granite or dyed jasper by its distinctive inclusion pattern and lack of banding. Commonly sold from Chihuahua, Mexico.
