mineral

Honey calcite (likely rough cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale honey-yellow, translucent, vitreous to pearly luster with curved cleavage surfaces; Mohs hardness 3, trigonal crystal structure, perfect rhombohedral cleavage, specific gravity about 2.71. The surrounding purple material appears to be a separate host rock, possibly mica-rich metamorphic rock.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, cavities, sedimentary limestones, and metamorphic marbles through precipitation of carbonate-rich fluids; calcite ranges from Precambrian to modern geological ages. Exact locality and age cannot be determined from the image.

Uses & applications

Used for cement, lime, agricultural soil treatment, optical experiments, and ornamental specimens; transparent honey calcite is occasionally cut for decorative objects but is too soft for durable jewelry.

Geological facts

Calcite strongly effervesces with dilute hydrochloric acid and commonly shows birefringence, making printed text appear doubled through clear pieces. Its rhombohedral cleavage distinguishes it from similarly colored quartz.

Field identification & locations

Test hardness against a copper coin or knife, observe rhombohedral cleavage, and apply dilute acid to a concealed spot; fizzing supports calcite identification. Common worldwide, especially in Mexico, Iceland, the United States, and China.