mineral

Calcite (likely honey/orange calcite)

Calcite — calcium carbonate, CaCO₃

AI-generated identification · may be incorrect

Pale cream to honey-orange, translucent, with a glassy to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The image is somewhat blurred, so quartz or gypsum remain possible alternatives.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms by precipitation from groundwater, hydrothermal fluids, or limestone-forming marine environments; the specimen may be a cleavage fragment from a sedimentary or vein deposit. Calcite occurs widely in relatively young sedimentary rocks, including the Miocene–Pleistocene basin sediments around Budapest and central Hungary.

Uses & applications

Used for cement, lime, aggregate, soil neutralization, and industrial calcium carbonate; attractive transparent crystals are collected, though this small fragment has little jewelry value.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar (vinegar may react slowly), unlike quartz. It commonly shows double refraction through clear pieces.

Field identification & locations

Likely regional and field-plausible near 47.6°N, 19.3°E, where limestone, marl, and calcite-rich veins are common. Test gently: it should scratch with a steel knife and react with acid; avoid acid if preservation matters.