mineral
Fluorescent tumbled mineral specimen, likely calcite
Calcite (calcium carbonate, CaCO₃), probable UV-fluorescent variety
AI-generated identification · may be incorrectThe 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.
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Physical properties
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.
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.
