mineral

Polished calcite sphere

Calcite (CaCO₃), likely banded or massive calcite

AI-generated identification · may be incorrect

Creamy yellow, polished, pearly-to-vitreous luster; Mohs hardness 3, trigonal crystal system, perfect rhombohedral cleavage, specific gravity about 2.7. The photo alone cannot confirm calcite; similar-looking aragonite or other stone is possible.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary rocks, hydrothermal veins, and caves through precipitation or biological accumulation; specimens may range from recent to hundreds of millions of years old. This sphere has been cut and polished from natural material.

Uses & applications

Decorative and collectible sphere; calcite is also used in cement, lime, and as an industrial filler.

Geological facts

Calcite effervesces in dilute acid and shows double refraction in clear pieces. Its softness and cleavage make it more easily scratched or chipped than quartz.

Field identification & locations

A cream color and polish are not diagnostic; check hardness and acid reaction on an inconspicuous spot to distinguish calcite. Calcite is widespread worldwide, including limestone and marble deposits.