mineral

Likely green fluorite or calcite specimen

Fluorite (CaF₂) or calcite (CaCO₃); identification is uncertain from the image

AI-generated identification · may be incorrect

Pale green, translucent, and partly crystalline with uneven cleavage; fluorite has Mohs hardness 4 and cubic crystals, while calcite has hardness 3, rhombohedral cleavage, and stronger birefringence. The attached dark-brown material may be matrix or iron staining.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a hydrothermal vein, where mineral-rich fluids deposited crystals in fractures; such deposits range from Paleozoic to younger ages depending on locality.

Uses & applications

Fluorite is used as a flux and fluorine source, while calcite is used in cement, lime, construction aggregate, and decorative specimens. This small piece has modest collector value.

Geological facts

Green fluorite commonly fluoresces blue, purple, or green under ultraviolet light; calcite commonly effervesces with dilute hydrochloric acid.

Field identification & locations

Check crystal geometry, cleavage, hardness, UV fluorescence, and acid reaction; common sources include China, Mexico, the United States, and Europe. Avoid destructive tests on valuable specimens.