mineral
Fluorescent calcite (probable)
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectA pale, rough translucent fragment viewed under strong violet/UV illumination, likely fluorescing blue-violet or pink. Calcite has Mohs hardness 3, vitreous to pearly luster, trigonal crystal structure, and perfect rhombohedral cleavage; it effervesces in dilute hydrochloric acid.
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Physical properties
A pale, rough translucent fragment viewed under strong violet/UV illumination, likely fluorescing blue-violet or pink. Calcite has Mohs hardness 3, vitreous to pearly luster, trigonal crystal structure, and perfect rhombohedral cleavage; it effervesces in dilute hydrochloric acid.
Formation & geological history
Usually forms in limestone, marble, hydrothermal veins, caves, and sedimentary cavities; specimens may be geologically young or hundreds of millions of years old. Fluorescence commonly results from trace manganese or other activator elements.
Uses & applications
Used industrially for cement, lime, aggregate, agricultural soil treatment, and optical calcite; attractive fluorescent specimens are collected. Jewelry use is limited because it is soft and easily cleaved.
Geological facts
Identification should be confirmed with a hardness test, acid fizz, and examination of cleavage; UV color alone is not diagnostic. Common sources include Mexico, the United States, China, and the United Kingdom.
Field identification & locations
Look for rhombohedral cleavage, low hardness, and vigorous acid reaction; avoid scratching valuable material. The image’s intense purple lighting prevents reliable color and fluorescence assessment.
