mineral

Yellow calcite cabochon

Calcite (calcium carbonate, CaCO₃), likely honey/yellow calcite

AI-generated identification · may be incorrect

Hardness 3 Mohs; translucent yellow to honey coloration, vitreous to waxy luster, and commonly cloudy or mottled internal zoning. Trigonal crystal system with perfect rhombohedral cleavage; specific gravity about 2.71.

Identified September 15, 2026More mineral →

Explore Yellow calcite cabochon in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms from calcium-rich hydrothermal fluids, cave deposits, or sedimentary carbonate alteration; yellow color commonly comes from iron or other trace impurities. The polished shape is human-processed, so its precise geological age cannot be determined.

Uses & applications

Used as a decorative cabochon, carving material, and collector specimen; calcite broadly supplies lime and cement, though this quality is mainly ornamental.

Geological facts

Calcite effervesces readily in cold dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. It is much softer than quartz and scratches easily.

Field identification & locations

Identify by its low hardness, rhombohedral cleavage, and acid reaction; common sources include Mexico, Brazil, Iceland, and the United States. Avoid ultrasonic cleaners and harsh abrasion because polished calcite is fragile.