mineral

Yellow calcite (rough crystal)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Pale honey-yellow, translucent, with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3. Its crystal structure is trigonal, though this fragment has no clear crystal form.

Identified October 10, 2026More mineral →

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Physical properties

Pale honey-yellow, translucent, with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3. Its crystal structure is trigonal, though this fragment has no clear crystal form.

Formation & geological history

Calcite forms in sedimentary limestone and marble, hydrothermal veins, and cavities as calcium-carbonate-rich fluids precipitate. It occurs from ancient rocks to modern deposits; the specimen’s age and source cannot be determined from the image.

Uses & applications

Calcite is used in cement, lime, and industrial fillers; clear or colorful crystals are collected and sometimes cut for display, but this rough piece appears modest in value.

Geological facts

Calcite effervesces in dilute acid and shows strong double refraction in clear pieces. Yellow color may result from trace impurities or inclusions.

Field identification & locations

A soft, pale-yellow translucent fragment with cleavage surfaces is consistent with calcite, but visual identification alone is not definitive. Calcite is widespread in limestone regions and hydrothermal deposits.