mineral

Tumbled orange calcite

Calcite (CaCO₃), likely iron-stained honey/orange calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, translucent orange-peach color, and rhombohedral cleavage; a tumbled piece has smoothed, rounded surfaces. It may effervesce visibly with dilute hydrochloric acid or strong vinegar.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, caves, hydrothermal veins, and carbonatite environments through precipitation from carbonate-rich fluids. Individual crystals may be ancient, ranging from Precambrian to modern, depending on the deposit.

Uses & applications

Used to manufacture cement, lime, aggregate, glass, and industrial fillers; clear varieties are collectible, while orange calcite is commonly sold as a decorative or metaphysical tumbled stone.

Geological facts

Iron impurities commonly produce orange, honey, or peach coloration. Calcite exhibits strong birefringence, so transparent pieces can show doubled images through them.

Field identification & locations

Identify it by its softness, rhombohedral cleavage, pale streak, and acid reaction; it is easily scratched by a steel knife. Common sources include Mexico, Brazil, the United States, and Europe.