mineral

Tumbled calcite-rich stone

Calcite (CaCO₃), likely honey/orange calcite; possibly calcitic marble or limestone

AI-generated identification · may be incorrect

Cream, honey, and orange coloring with a matte-to-vitreous luster and granular crystalline texture; Mohs hardness 3, excellent rhombohedral cleavage, white streak, and specific gravity about 2.71. The rounded surface appears mechanically polished or naturally worn.

Identified September 9, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms by precipitation from carbonate-rich groundwater, marine sediments, hydrothermal fluids, or metamorphism of limestone; its exact geological age cannot be determined from the image. Orange coloration commonly results from iron-oxide impurities.

Uses & applications

Used in cement, lime, aggregate, soil treatment, and industrial calcium carbonate; attractive pieces are sold as lapidary or decorative specimens. Calcite is generally inexpensive unless exceptionally clear, large, or well-crystallized.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface. It commonly shows rhombohedral cleavage and can display double refraction in transparent varieties.

Field identification & locations

Likely from carbonate-rich regions worldwide, including Mexico, the United States, Iceland, and Europe; test with a steel nail for softness and acid for fizzing, while avoiding damage to valuable specimens.