mineral

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically honey-yellow to orange, translucent, with a vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The specimen appears to be a rough cleavage fragment with pale, cloudy inclusions or surface alteration.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary limestone, hydrothermal veins, cavities, and metamorphic marble, commonly through precipitation from calcium-rich fluids. Calcite deposits range from young cave and vein formations to Precambrian carbonate rocks, so an exact age cannot be determined visually.

Uses & applications

Used for cement, lime, aggregate, soil treatment, and chemical applications; transparent, well-colored pieces are collected or occasionally used as ornamental stone. It is too soft for most durable jewelry.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or household vinegar, though vinegar reacts more slowly. It commonly exhibits double refraction in clear pieces and fluoresces in some varieties.

Field identification & locations

Identify by its rhombohedral cleavage, softness, and acid reaction; common localities include Mexico, Iceland, the United States, and many carbonate-rock regions worldwide. Avoid prolonged soaking or abrasion because it scratches easily and dissolves in acids.