mineral

Honey calcite crystal fragment

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Small translucent honey-yellow fragment with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.71. The irregular shape may be a broken or weathered crystal.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms in limestone, hydrothermal veins, caves, and sedimentary cavities through precipitation from calcium-rich fluids. Its exact geological age cannot be determined from the photograph; formation ranges from recent cave deposits to ancient sedimentary and vein systems.

Uses & applications

Used in cement, lime, aggregate, chemical manufacturing, and optical calcite specimens; transparent colored crystals are collected and occasionally used decoratively rather than in jewelry.

Geological facts

Calcite effervesces vigorously in dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. Honey coloration commonly results from iron or other trace impurities.

Field identification & locations

Look for rhombohedral cleavage, relatively soft surfaces, and acid fizz; it can be scratched by a steel nail or knife. Common worldwide, especially in limestone regions, hydrothermal veins, and caves.