mineral

Fluorescent tumbled mineral specimen, likely calcite

Calcite (calcium carbonate, CaCO₃), probable UV-fluorescent variety

AI-generated identification · may be incorrect

The bright pink-orange fluorescence under ultraviolet light is typical of activator-bearing calcite; unlit color, hardness (Mohs 3), cleavage, and luster cannot be confirmed from the image. Calcite is trigonal and commonly has vitreous to pearly luster and rhombohedral cleavage.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in limestone, hydrothermal veins, caves, and sedimentary cavities; specimens may range from modern deposits to Paleozoic or younger host rocks. Fluorescence results from trace activators such as manganese.

Uses & applications

Used in cement, lime, aggregate, soil treatment, and as a mineral collector’s specimen; attractive fluorescent pieces are sold for display and UV collections.

Geological facts

Fluorescence is not diagnostic by itself: aragonite, fluorite, willemite, and some other minerals can glow different colors. A hardness, acid, and cleavage test would improve identification.

Field identification & locations

Check for rhombohedral cleavage and fizzing with dilute hydrochloric acid; calcite commonly occurs worldwide, especially in limestone regions and hydrothermal deposits. Avoid acid testing valuable specimens.