sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
AI-generated identification · may be incorrectHardness of 3 on Mohs scale. Distinct alternating white, cream, and dark grey-to-black bands. Vitreous to dull luster, rhombohedral cleavage, trigonal crystal system.
Identified More sedimentary →
Explore Banded Calcite (Zebra Calcite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary