mineral

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically honey-orange to peach, translucent, with a vitreous to pearly luster; Mohs hardness 3, rhombohedral crystal structure and perfect rhombohedral cleavage. The rounded shape indicates tumbling or natural abrasion.

Identified September 3, 2026More mineral →

Explore Tumbled orange calcite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, caves, and metamorphic marbles; orange color commonly comes from iron or other inclusions. Deposits range from ancient Precambrian rocks to modern cave and vein growth.

Uses & applications

Used for cement, lime, aggregate, soil treatment, and chemical manufacture; attractive transparent pieces are sold as decorative or metaphysical specimens. This small tumbled piece generally has modest commercial value.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, though vinegar may react slowly. It can be scratched easily with a steel nail or knife and commonly shows rhombohedral cleavage if broken.

Field identification & locations

Common worldwide, including Mexico, the United States, Brazil, Iceland, and China. Identify it by its soft hardness, pale orange translucency, cleavage, and acid reaction; the photograph alone cannot distinguish it with certainty from orange aragonite or quartz-bearing material.