mineral

Honey calcite (optical calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Mohs hardness 3; pale honey to colorless, translucent, vitreous-to-pearly luster, prominent rhombohedral cleavage, and trigonal crystal structure. The blocky shape and flat cleavage faces are characteristic; it may show strong double refraction.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-rich fluids precipitate carbonate, commonly in hydrothermal veins, caves, and sedimentary limestone environments. Calcite deposits range from Paleozoic to modern, so age cannot be determined from the image.

Uses & applications

Used in cement, lime, construction aggregate, soil treatment, and optical/calibration specimens; transparent pieces are collected as mineral specimens. It is generally unsuitable for durable jewelry because it scratches easily.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid and can be scratched by a steel knife. “Optical calcite” or Iceland spar is prized for its clear birefringence, while honey calcite is valued mainly for color and translucency.

Field identification & locations

Identify by rhombohedral cleavage, low hardness, acid reaction, and double refraction; quartz is harder and lacks cleavage. Common worldwide, especially in Mexico, Iceland, the United States, and China.