mineral

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, white to orange color, rhombohedral crystal structure, and perfect rhombohedral cleavage; specific gravity about 2.71. The small, rough fragment appears orange and possibly translucent, though lighting limits certainty.

Identified August 7, 2026More mineral →

Explore Orange calcite fragment 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 environments, hydrothermal veins, caves, and carbonatite or metamorphic rocks; orange coloration commonly results from iron-oxide inclusions or surface staining. Its age depends on the host deposit, ranging from recent cave growth to ancient Paleozoic or older mineralization.

Uses & applications

Used in cement, lime, construction aggregate, soil treatment, and chemical production; attractive transparent or strongly colored specimens are collected and occasionally carved. Orange calcite is generally an inexpensive decorative mineral.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid and may fluoresce under ultraviolet light. It is easily scratched by a steel knife and is much softer than quartz.

Field identification & locations

Common localities include Mexico, the United States, Brazil, and China; field identification relies on softness, rhombohedral cleavage, and acid reaction. The image alone cannot distinguish calcite confidently from orange aragonite or resin-coated material.