metamorphic
Tumbled zebra stone, likely zebra marble or banded calcite
Zebra marble (recrystallized calcite, CaCO₃), possibly black-and-white banded calcite
AI-generated identification · may be incorrectBlack-and-white irregular bands with a pale, opaque surface and weak vitreous-to-waxy luster; likely Mohs 3, with calcite cleavage and specific gravity near 2.7. The rounded shape indicates tumbling or polishing, and the image does not show diagnostic crystal faces.
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Physical properties
Black-and-white irregular bands with a pale, opaque surface and weak vitreous-to-waxy luster; likely Mohs 3, with calcite cleavage and specific gravity near 2.7. The rounded shape indicates tumbling or polishing, and the image does not show diagnostic crystal faces.
Formation & geological history
Zebra marble forms when limestone is metamorphosed and recrystallized, with dark graphite- or carbon-rich layers producing the striping; deposits are found in several regions, including Mexico and Africa. Its exact geological age and locality cannot be determined from the photograph.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and ornamental objects; similar marble is also used for tiles and decorative stone.
Geological facts
The stripes are natural compositional banding rather than painted markings in most examples. Calcite may fizz with dilute hydrochloric acid, though testing can damage a polished specimen.
Field identification & locations
Check for consistent banding throughout, a Mohs hardness around 3, and vigorous acid effervescence; it should scratch with a steel knife. Common polished pieces are sold as zebra marble or zebra calcite.
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