mineral

Green calcite (likely)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Pale green, translucent, glassy to pearly luster with prominent rhombohedral cleavage; Mohs hardness 3, typically white streak, and specific gravity about 2.71. The irregular broken surface and cloudy internal veining are consistent with calcite, though fluorite or glass are alternatives without testing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in hydrothermal veins, limestone cavities, and sedimentary environments; green coloration commonly comes from trace inclusions or impurities. Specimen age cannot be determined from the image and may range from geologically young to ancient.

Uses & applications

Used in cement, lime, agricultural soil treatment, and chemical manufacturing; attractive transparent pieces are collected, but this fragment is generally not gem-grade.

Geological facts

Calcite effervesces readily in dilute hydrochloric acid or strong vinegar, and its cleavage produces rhombohedral fragments. It is usually softer than a steel knife, while fluorite is harder (Mohs 4).

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, and China. Confirm by acid fizz and cleavage; avoid scratching valuable material, and check for bubbles or uniformity if manufactured glass is suspected.