mineral

Honey calcite (likely cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Honey-yellow to gray, translucent, vitreous to pearly luster, prominent rhombohedral cleavage, and hardness 3 on the Mohs scale; calcite is trigonal and has specific gravity about 2.71. The broad flat reflective surfaces and weakly colored zones are consistent with calcite, though some quartz or feldspar may be present…

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary limestone, hydrothermal veins, cavities, and metamorphic marbles through precipitation from carbonate-rich fluids. Calcite occurs from ancient to modern geological settings; the specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Used in cement, lime, agriculture, chemical production, and optical research; transparent honey calcite is also collected and occasionally cut as a decorative gemstone. Common specimens generally have modest value.

Geological facts

Calcite can effervesce strongly with dilute hydrochloric acid or vinegar, unlike quartz; it may show double refraction through clear areas. Cleavage surfaces commonly produce its characteristic slanted, glassy faces.

Field identification & locations

Common worldwide in limestone regions, hydrothermal deposits, and marble; identify with rhombohedral cleavage, low hardness, and acid reaction. Exact identification would benefit from an acid test, hardness test, and locality information.