mineral

Raw yellow calcite

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale yellow, translucent-to-opaque, with a vitreous to pearly luster and granular/crystalline texture. Mohs hardness 3; excellent rhombohedral cleavage, uneven fracture, and typically low-to-moderate specific gravity (~2.71).

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, caves, and sedimentary settings; it may also occur in metamorphic marble. The specimen’s geological age cannot be determined from the image.

Uses & applications

Used in cement, lime, agricultural soil treatment, optical instruments, and mineral collecting; attractive transparent specimens may be cut or polished as decorative material.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, though vinegar’s reaction may be slow. It shows birefringence: printed text viewed through a clear piece can appear doubled.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, and China. Identify it by its softness, rhombohedral cleavage, pale colors, and acid reaction; the image alone cannot exclude pale gypsum or aragonite.