sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
Hardness of 3 on Mohs scale. Distinct alternating white, cream, and dark grey-to-black bands. Vitreous to dull luster, rhombohedral cleavage, trigonal crystal system.
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Physical properties
Hardness of 3 on Mohs scale. Distinct alternating white, cream, and dark grey-to-black bands. Vitreous to dull luster, rhombohedral cleavage, trigonal crystal system.
Formation & geological history
Formed via low-temperature precipitation of calcium carbonate from hydrothermal solutions or cave waters, depositing sequential layers of pure calcite and mineral- or organic-rich layers.
Uses & applications
Used primarily as decorative polished stones, tumbled stones, carvings, cabochons for wire-wrapping, and lapidary specimens.
Geological facts
Calcite reacts vigorously with dilute hydrochloric acid, producing effervescence. Zebra Calcite is often prized by collectors for its striking zebra-stripe patterning.
Field identification & locations
Identified by its distinctive black-and-white alternating bands and low hardness (can be easily scratched with a copper penny or steel nail). Commonly found in Mexico, South Africa, and the USA.
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