mineral

Banded calcite (likely cave deposit or vein fragment)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Cream, honey-orange and white translucent bands with a vitreous to pearly luster; Mohs hardness 3, rhombohedral crystals/cleavage, and specific gravity about 2.71. The layered appearance may reflect fibrous or microcrystalline growth and iron-oxide staining.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich groundwater precipitates in caves, hot-spring deposits, or fractures; individual deposits may range from modern to millions of years old. It is not classifiable as igneous, sedimentary, or metamorphic in hand-specimen form, though it may occur within any host rock.

Uses & applications

Used for cement, lime, aggregate, and chemical processing; attractive banded pieces are sold as decorative or lapidary material. It is generally a modest collector specimen rather than jewelry-grade material.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or household vinegar, though vinegar may react slowly. Its rhombohedral cleavage and softness distinguish it from quartz, which is much harder and does not fizz.

Field identification & locations

Common worldwide in limestone caves, hydrothermal veins, and sedimentary formations; major sources include Mexico, the United States, Brazil, and Europe. Confirm with a steel knife scratch and acid fizz test; image identification is tentative because the specimen is small and partly weathered.