mineral

Tumbled honey calcite (probable)

Calcite — calcium carbonate, CaCO₃

AI-generated identification · may be incorrect

Pale honey-yellow, translucent mineral with vitreous to pearly luster and irregular cleavage surfaces; Mohs hardness 3, typically rhombohedral crystal structure, specific gravity about 2.71. The image is insufficient for definitive identification; yellow aragonite or quartz are alternatives.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in carbonate veins, caves, or sedimentary limestone environments through hydrothermal or groundwater precipitation; age varies widely from Paleozoic to Recent. Its rounded shape indicates human tumbling or natural abrasion.

Uses & applications

Used for cement, lime, construction aggregate, optical calcite, and decorative specimens; attractive transparent pieces are collected but generally inexpensive.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or vinegar when powdered, unlike quartz. It commonly shows strong double refraction through clear pieces.

Field identification & locations

Test cautiously: calcite scratches with a copper coin or steel knife and reacts with acid; quartz does not and is much harder. Common worldwide, especially in Mexico, the United States, Iceland, and Europe.