mineral

Yellow calcite

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Translucent pale-yellow, vitreous to pearly luster, prominent rhombohedral cleavage, and commonly hardness 3 Mohs; typically forms trigonal crystals. The rough, irregular specimen may also contain minor cloudy inclusions or surface weathering.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Calcite precipitates from groundwater, hydrothermal fluids, caves, and sedimentary environments, often forming veins, geodes, and limestone deposits. Its age cannot be determined from the image and may range from recent growth to ancient Paleozoic or older host-rock formation.

Uses & applications

Used to manufacture cement and lime, as a flux, soil conditioner, and optical material; attractive transparent yellow crystals are collectible, though this piece appears low-grade.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or household vinegar, though vinegar may react slowly. It shows birefringence: printed text viewed through a clear fragment may appear doubled.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, China, and Morocco. Identify it by its softness, rhombohedral cleavage, and acid reaction; avoid scratching or acidic cleaning.