mineral

Fluorescent calcite (probable)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

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.

Identified September 5, 2026More mineral →

Explore Fluorescent calcite (probable) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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.