mineral

Yellow calcite specimen

Calcite (CaCO₃), likely honey/yellow calcite with associated matrix

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, transparent to translucent yellow crystals, rhombohedral cleavage, and trigonal crystal structure; effervesces vigorously in dilute hydrochloric acid. The specimen appears partly crystalline and possibly coated or matrix-supported.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms from carbonate-rich hydrothermal fluids, caves, sedimentary environments, and cavities in volcanic rocks; its age depends on the host deposit and cannot be determined from the image. Yellow coloration commonly results from iron or other trace impurities.

Uses & applications

Used for construction aggregate, cement, lime, optical calcite, and industrial calcium carbonate; attractive crystals are sold as display specimens, usually not as jewelry due to softness and cleavage.

Geological facts

Calcite shows strong birefringence: text viewed through a clear crystal may appear doubled. Honey calcite is a common collector variety, but color alone does not distinguish it from yellow aragonite or coated minerals.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid reaction; a steel knife can scratch it, while quartz cannot. Common worldwide, including Mexico, Brazil, China, the United States, and Morocco.