metamorphic
Dalmatian jasper beads
Commercially “Dalmatian jasper”; commonly spotted, silica-rich rock sold as jasper, though many specimens are feldspar-rich rock rather than true jasper (microcrystalline quartz).
AI-generated identification · may be incorrectPolished, opaque cream-white beads with irregular black spots; typically Mohs 6–7, vitreous to dull luster, and no visible cleavage. Exact composition cannot be confirmed from the image; black spots are often attributed to tourmaline or other dark minerals.
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Physical properties
Polished, opaque cream-white beads with irregular black spots; typically Mohs 6–7, vitreous to dull luster, and no visible cleavage. Exact composition cannot be confirmed from the image; black spots are often attributed to tourmaline or other dark minerals.
Formation & geological history
Formed as a silica- and feldspar-bearing rock, with dark mineral grains distributed through a pale matrix; the precise geological age and origin depend on the source deposit.
Uses & applications
Used mainly for beads, jewelry, and decorative objects; not generally a major construction material.
Geological facts
The trade name refers to its black-and-white pattern resembling a Dalmatian dog; “jasper” is often used loosely in the gemstone trade.
Field identification & locations
Recognize it by the opaque pale ground and contrasting irregular black spots, but visual inspection alone cannot establish mineral identity. Similar material is sold from several localities, including Mexico.
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