metamorphic
Dalmatian jasper (polished stone beads)
Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper
AI-generated identification · may be incorrectCreamy white to beige matrix with black spots, polished vitreous-to-waxy luster; typically Mohs 6–7. Mineral grains are fine and interlocking; hardness and density vary with composition.
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Physical properties
Creamy white to beige matrix with black spots, polished vitreous-to-waxy luster; typically Mohs 6–7. Mineral grains are fine and interlocking; hardness and density vary with composition.
Formation & geological history
A natural feldspar-rich igneous rock, commonly associated with volcanic activity; the dark minerals crystallized within the lighter matrix. It is quarried chiefly in Chihuahua, Mexico; the exact geological age is deposit-dependent.
Uses & applications
Cut and polished for beads, cabochons, ornaments, and small carvings; little industrial use.
Geological facts
Despite its trade name, Dalmatian jasper is generally not jasper, which is an opaque variety of chalcedony.
Field identification & locations
Recognized by its pale background and irregular dark spots; genuine material is commonly sold as polished beads. The pictured beads do not establish the exact rock composition.
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