mineral

Orange calcite (likely an iron-stained calcite specimen)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Orange to rust-colored, translucent-to-opaque mass with a vitreous to dull luster; calcite is trigonal, Mohs hardness 3, and has perfect rhombohedral cleavage. The photo does not show diagnostic crystal faces, so identification is provisional.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms by precipitation from groundwater or hydrothermal fluids and in sedimentary deposits; orange coloration may come from iron impurities. Its age and exact formation environment cannot be determined from the image.

Uses & applications

Common calcite is used in cement, lime, and as a mineral specimen; attractive translucent pieces are collected or occasionally cut for decorative objects.

Geological facts

Calcite effervesces readily in dilute hydrochloric acid and can be scratched with a copper coin, useful tests for distinguishing it from harder orange minerals.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid reaction; orange calcite occurs in many limestone and hydrothermal districts worldwide. The image alone cannot confirm the identification.