mineral
Green Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
Hardness of 3 on the Mohs scale, colors range from pale green to deep forest green with white, brown, or orange bands, vitreous to pearly luster, trigonal crystal system, perfect rhombohedral cleavage, specific gravity of 2.71.
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Physical properties
Hardness of 3 on the Mohs scale, colors range from pale green to deep forest green with white, brown, or orange bands, vitreous to pearly luster, trigonal crystal system, perfect rhombohedral cleavage, specific gravity of 2.71.
Formation & geological history
Formed through the precipitation of calcium carbonate from mineral-rich waters in caves, hot springs, or as stalactites and flowstones, often in sedimentary environments over geological time.
Uses & applications
Widely used in decorative carvings, crystal towers, polished shapes, metaphysical practices, and ornamental objects.
Geological facts
Green banded calcite is frequently marketed commercially as 'green onyx' due to its banded appearance, though true onyx is a variety of chalcedony with a quartz base. Calcite vigorously effervesces when exposed to dilute hydrochloric acid.
Field identification & locations
Easily identified by its characteristic banding, softness (can easily be scratched with a knife or copper penny), and acid reaction. Commonly sourced from Mexico, Pakistan, and Peru.
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