mineral

Yellow calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically honey-yellow to mustard, translucent to opaque, with a vitreous-to-waxy luster; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded shape indicates tumbling or natural water-worn abrasion.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly by precipitation from carbonate-rich groundwater, hydrothermal fluids, or sedimentary limestone replacement; specimens may range from recent deposits to rocks hundreds of millions of years old. Exact age and locality cannot be determined from the image.

Uses & applications

Used in cement, lime, aggregate, chemical manufacture, and as a collector mineral; attractive transparent pieces may be cut as ornamental stone, though calcite is too soft for most jewelry.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid and shows birefringence when clear. Yellow color commonly reflects iron or other trace impurities.

Field identification & locations

Identify by its softness, rhombohedral cleavage, white streak, and vigorous acid reaction; distinguish from yellow quartz, which is much harder. Common worldwide, including Mexico, the United States, Brazil, and China.