mineral

Honey calcite (optical calcite)

Calcite — calcium carbonate, CaCO₃

AI-generated identification · may be incorrect

Usually honey-yellow to amber, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The specimen appears as a rough, cleaved crystalline mass, possibly showing optical doubling through clear areas.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary limestones, hydrothermal veins, caves, and carbonatite environments through precipitation or alteration; individual crystals may range from recent to Paleozoic or older depending on the host deposit. Geological age cannot be determined from the image alone.

Uses & applications

Used to manufacture cement, lime, agricultural soil amendments, and carbonate fillers; clear optical calcite is collected and historically used in optical instruments. Attractive honey-colored pieces are sold as display specimens.

Geological facts

Calcite effervesces visibly in dilute hydrochloric acid and is easily scratched by a steel knife. Clear varieties can strongly double images viewed through the crystal.

Field identification & locations

Identify by rhombohedral cleavage, softness, and acid reaction; common sources include Mexico, Iceland, the United States, and China. Avoid vinegar as a definitive test because its weak acidity may react slowly.