mineral

Greenish calcite (likely), possibly talc-bearing marble

Calcite, CaCO₃; green coloration may reflect chlorite, epidote, or serpentine inclusions

AI-generated identification · may be incorrect

White to pale green, translucent to opaque, vitreous to pearly luster, irregular blocky cleavage, and likely Mohs hardness 3; calcite is trigonal and has specific gravity about 2.71. The specimen appears crystalline and partly foliated or layered, so a marble matrix is also possible.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms from hydrothermal fluids, cavities, or metamorphism of limestone; marble forms during regional or contact metamorphism, generally from Paleozoic to younger protoliths. The green areas likely represent included or intergrown alteration minerals.

Uses & applications

Calcite is used in cement, lime, aggregate, and optical specimens; decorative marble is used for tiles, sculpture, and countertops. Attractive green-and-white pieces are mainly sold as mineral specimens.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar when freshly scratched, unlike quartz. Its three-direction cleavage and relatively soft surface are diagnostic.

Field identification & locations

Common in limestone and marble districts worldwide, including Mexico, the United States, Brazil, and Europe. Test a concealed fresh surface for acid reaction and scratchability; exact identification requires hardness, acid, and possibly microscopy tests.