mineral

Honey calcite (rough cleavage fragment)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Golden-brown, translucent with a vitreous to pearly luster and prominent curved-looking cleavage surfaces; calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The image alone cannot confirm the identification; similar-looking minerals include fluorite and gypsum.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich fluids precipitate in veins, cavities, or sedimentary settings; specimens may range from geologically young to ancient.

Uses & applications

Used as a decorative and collector mineral; calcite is also an important raw material for cement, lime, and agricultural products.

Geological facts

Calcite strongly effervesces in dilute hydrochloric acid and is readily scratched by a copper coin. Its double refraction is especially visible in clear crystals.

Field identification & locations

Look for softness, rhombohedral cleavage, and acid reaction; honey-colored calcite occurs worldwide, including Mexico, the United States, and Europe. Confirm with simple tests before distinguishing it from similar minerals.