mineral
Green calcite (likely)
Calcite, CaCO₃; green coloration commonly caused by inclusions or trace elements
AI-generated identification · may be incorrectPale mint-green, translucent to opaque, with a vitreous to pearly luster and uneven cleavage surfaces. Mohs hardness 3; trigonal crystal structure, excellent rhombohedral cleavage, and specific gravity about 2.71.
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Physical properties
Pale mint-green, translucent to opaque, with a vitreous to pearly luster and uneven cleavage surfaces. Mohs hardness 3; trigonal crystal structure, excellent rhombohedral cleavage, and specific gravity about 2.71.
Formation & geological history
Forms in hydrothermal veins, cavities, and carbonate-rich sedimentary environments through precipitation from mineral-bearing fluids; the specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Used mainly as a collector mineral and decorative specimen; calcite is also important industrially in cement, lime, aggregate, and chemical production.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid and shows birefringence when viewed through a clear fragment. Green calcite is often confused with fluorite, prehnite, or pale jade.
Field identification & locations
Look for low hardness, rhombohedral cleavage, and acid reaction; a steel blade can scratch it, while fluorite is harder and commonly cubic-cleaving. Common sources include Mexico, Brazil, China, and the United States.
