mineral

Tumbled honey calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Translucent honey-yellow to tan, with a vitreous-to-pearly luster and visible curved cleavage surfaces or internal zoning. Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71; the rounded shape indicates tumbling.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Calcite precipitates from carbonate-rich groundwater, hydrothermal fluids, or sedimentary environments, commonly forming in limestone cavities and veins. The specimen’s exact age and locality cannot be determined visually.

Uses & applications

Used for cement, lime, aggregate, soil treatment, and acid neutralization; transparent varieties are collected and sometimes carved. This small tumbled piece has modest decorative value.

Geological facts

Calcite strongly effervesces with dilute hydrochloric acid or vinegar, though vinegar may react slowly. It is softer than a steel knife and commonly shows optical double refraction in clear pieces.

Field identification & locations

Identify by its softness, rhombohedral cleavage, pale honey color, and acid reaction; quartz will not scratch easily or fizz. Common worldwide, especially in limestone districts and hydrothermal deposits.