mineral

Yellow calcite pebble

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, pale yellow to honey color, and translucent edges; rhombohedral cleavage is characteristic. The rounded shape indicates natural abrasion or tumbling.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by precipitation in limestone, veins, caves, or hydrothermal settings; calcite occurs from recent deposits through rocks of virtually all geological ages. Exact locality and age cannot be determined from the image.

Uses & applications

Used in cement, lime, aggregate, soil treatment, and chemical manufacture; attractive transparent or honey-colored specimens are collected. It is generally too soft for durable jewelry.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or household vinegar, though vinegar reacts more slowly. Its cleavage and potential double refraction are useful diagnostic features.

Field identification & locations

Common worldwide, especially in limestone regions, hydrothermal veins, and caves. Confirm with a steel-knife hardness test and acid fizz; the surrounding dark material appears to be a separate fine-grained host rock.