mineral

Yellow calcite (probable)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale yellow, translucent-to-opaque specimen with a vitreous to pearly luster and likely rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The irregular shape and cleavage surfaces are consistent with calcite, though the image alone cannot exclude yellow quartz or aragonite.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms in hydrothermal veins, limestone cavities, and sedimentary deposits through precipitation from carbonate-rich water; individual specimens may range from recent to Precambrian in age. Yellow coloration can result from iron, hydrocarbons, or other trace impurities.

Uses & applications

Used industrially for cement, lime, aggregate, soil treatment, and chemical manufacture; attractive crystals are collected, but this small rough piece has little jewelry value because it is soft and cleaves easily.

Geological facts

Calcite effervesces vigorously in dilute hydrochloric acid or strong vinegar, unlike quartz. It commonly shows birefringence, making printed text appear doubled through a clear fragment.

Field identification & locations

Common localities include Mexico, the United States, Iceland, China, and Peru; test cautiously with a steel nail and acid, preferably on an inconspicuous area. The pictured specimen appears natural and unpolished.