igneous
Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
AI-generated identification · may be incorrectCream to tan, opaque, with distinctive rounded black spots; typically Mohs 6.5–7, vitreous to dull luster, massive and non-cleavable. The exact mineral identity of the black inclusions varies, so visual identification is approximate.
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Physical properties
Cream to tan, opaque, with distinctive rounded black spots; typically Mohs 6.5–7, vitreous to dull luster, massive and non-cleavable. The exact mineral identity of the black inclusions varies, so visual identification is approximate.
Formation & geological history
A lapidary trade name for a spotted volcanic rock, commonly associated with Oligocene volcanic rocks of Mexico; formed when silica-rich lava cooled and crystallized, with dark minerals becoming concentrated as spots. Its geological age is generally tens of millions of years.
Uses & applications
Polished into cabochons, beads, carvings, worry stones, and decorative objects; mainly valued as an ornamental stone rather than for industrial use.
Geological facts
Despite its name, it is not true jasper in the strict mineralogical sense and is unrelated to Dalmatian dogs. Some similar-looking material is sold as “Dalmatian stone” or “Dalmatian jasper.”
Field identification & locations
Identify it by the cream volcanic matrix and irregular black spots; a glassy streak or bubbles would suggest imitation. Commonly sourced from Chihuahua, Mexico; natural pieces are usually inexpensive.
