igneous
Dalmatian jasper (often sold as Dalmatian stone)
Quartz-bearing leucocratic alkali-feldspar–aegirine/arfvedsonite porphyritic rock; commercial “jasper” designation
AI-generated identification · may be incorrectCream to pale beige matrix with rounded black spots, commonly aegirine or arfvedsonite inclusions; hardness about 6–7 Mohs, opaque, matte to waxy luster, very fine-grained with no obvious cleavage. The pictured heart is polished and shaped.
Identified More igneous →
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Physical properties
Cream to pale beige matrix with rounded black spots, commonly aegirine or arfvedsonite inclusions; hardness about 6–7 Mohs, opaque, matte to waxy luster, very fine-grained with no obvious cleavage. The pictured heart is polished and shaped.
Formation & geological history
A volcanic or subvolcanic rock, generally associated with alkaline igneous bodies and formed as silica-poor magma crystallized and cooled; it is not a true jasper in the strict mineralogical sense. Specimens are especially associated with Chihuahua, Mexico, and are geologically much younger than Earth’s oldest rocks.
Uses & applications
Used for cabochons, beads, carvings, hearts, decorative stone, and inexpensive metaphysical collectibles; rarely used in construction.
Geological facts
The dramatic black spotting resembles a Dalmatian dog’s coat, giving the trade name. Black inclusions are typically aegirine/arfvedsonite rather than organic material or dye.
Field identification & locations
Identify by the cream matrix, naturally irregular black spots, and consistent hardness; glassy uniform spots or easily scratched material may indicate imitation. Commonly found in Chihuahua, Mexico; avoid strong acids and ultrasonic cleaning if fractures are present.
