mineral

Tumbled green calcite (probable)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale green, translucent-to-opaque tumbled pebble with pearly to vitreous luster; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded shape and surface polish indicate human processing.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in hydrothermal veins, carbonate cavities, or metamorphosed limestone; green color may result from inclusions or trace elements. Calcite occurs from Precambrian to modern deposits, but the specimen’s exact age cannot be determined visually.

Uses & applications

Used for cement, lime, aggregate, and neutralizing acidic materials; attractive green varieties are sold as inexpensive ornamental stones, carvings, and metaphysical specimens.

Geological facts

Calcite effervesces readily with dilute hydrochloric acid, distinguishing it from quartz and most green feldspar. It is strongly birefringent, producing doubled images through clear fragments.

Field identification & locations

Common sources include Mexico, Brazil, China, Peru, and the United States. Confirm with a copper coin or steel-point hardness test and acid reaction; avoid scratching polished surfaces.