mineral

Tumbled calcite (likely honey/orange calcite)

Calcite — calcium carbonate, CaCO₃

AI-generated identification · may be incorrect

Typically translucent cream to honey-orange, with pearly to vitreous luster and subtle banding; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded shape indicates tumbling or polishing.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary limestone, hydrothermal veins, caves, and marble through precipitation or recrystallization; calcite deposits range from Precambrian to modern. The specimen’s exact locality and age cannot be determined from the image.

Uses & applications

Used in cement, lime, aggregate, glassmaking, soil treatment, and chemical industries; attractive transparent or banded varieties are sold as decorative stones and metaphysical collectibles.

Geological facts

Calcite effervesces visibly in dilute hydrochloric acid and shows strong double refraction in clear pieces. Its softness means it scratches easily and should be kept away from harder minerals and acids.

Field identification & locations

Identify by its low hardness, rhombohedral cleavage, and acid reaction; common sources include Mexico, Brazil, the United States, Iceland, and China. A scratch test and acid test can distinguish it from quartz or chalcedony.