mineral

Banded Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 (Mohs scale), Color: layers of yellow, white, and grey, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: Perfect rhombohedral

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 3 (Mohs scale), Color: layers of yellow, white, and grey, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: Perfect rhombohedral

Formation & geological history

Formed through the chemical precipitation of calcium carbonate from cool or warm water solutions, typically in caves (forming stalactites/stalagmites) or hot springs as travertine. Most deposits are relatively young in geological terms.

Uses & applications

Primarily used as a decorative stone in lapidary arts, for carvings, home decor, and as a popular specimen for crystal collecting due to its aesthetic banding.

Geological facts

Calcite is one of the most common minerals on Earth, but banded varieties are often marketed as 'Mexican Onyx' or 'Calcite Onyx,' despite not Being true onyx (which is a form of chalcedony). It will effervesce (fizz) if a drop of weak acid like vinegar is applied.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its reactive nature to acids. Common locations include Mexico, Pakistan, and various limestone-rich regions worldwide.