mineral

Tumbled yellow-orange calcite

Calcite (CaCO₃), likely honey or orange calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, translucent yellow-orange color, and prominent rhombohedral cleavage; the specimen appears polished/tumbled with white veining. Calcite is trigonal and commonly effervesces in dilute hydrochloric acid.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms from carbonate-rich groundwater, hydrothermal fluids, or sedimentary limestone environments; orange color commonly reflects iron or other impurities. The geological age cannot be determined from the photograph and may range from recent deposits to ancient carbonate rocks.

Uses & applications

Used for cement, lime, agricultural soil treatment, and chemical manufacture; attractive transparent pieces are collected or used as decorative stone, though calcite is generally too soft for everyday jewelry.

Geological facts

Calcite is one of the most abundant carbonate minerals and exhibits strong birefringence; clear Iceland spar famously produces double images.

Field identification & locations

Commonly found in limestone, marble, caves, and hydrothermal veins worldwide, including Mexico, the United States, and Brazil. Distinguish it from harder quartz by its softness, cleavage, and acid reaction.