mineral

Green calcite (likely)

Calcite — calcium carbonate, CaCO₃

AI-generated identification · may be incorrect

Pale mint-green, translucent to opaque, with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The rough, irregular piece may also be green aragonite or dyed material, but its appearance is consistent with calcite.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms in limestone, hydrothermal veins, caves, and evaporite environments when carbonate-rich fluids precipitate; specimens range from recent deposits to rocks hundreds of millions of years old. Green coloration commonly comes from trace elements or inclusions.

Uses & applications

Used as a collector mineral, ornamental stone, and carbonate feedstock; calcite is also important in cement, lime, glass, agriculture, and neutralizing acids.

Geological facts

Calcite effervesces vigorously in dilute hydrochloric acid and displays strong birefringence, producing doubled images through clear pieces.

Field identification & locations

Commonly found in Mexico, Brazil, the United States, Iceland, and China. Confirm with a steel knife scratch test, acid fizz, and cleavage; avoid acid if preservation matters.