mineral

Likely tumbled calcite or limestone

Calcite (CaCO₃), possibly microcrystalline limestone

AI-generated identification · may be incorrect

Pale honey-yellow, opaque to translucent, with dull-to-waxy luster and irregular granular texture. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.71; the image alone cannot confirm these properties.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary environments, hydrothermal veins, caves, and altered carbonate rocks; limestone commonly consists of calcite formed from marine sediments, often over millions of years.

Uses & applications

Used in cement, agricultural lime, construction aggregate, fillers, and collectors’ specimens; attractive translucent pieces may be polished or sold as decorative stone.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or vinegar, though vinegar may react slowly. It commonly shows strong birefringence under transparent fragments.

Field identification & locations

Likely identification requires a hardness test and acid reaction: it should scratch with a steel knife and fizz with acid. Common worldwide, especially in limestone regions, Mexico, the United States, Iceland, and Europe.