mineral
Calcite
Calcite (CaCO₃), likely honey/yellow calcite
AI-generated identification · may be incorrectUsually Mohs hardness 3; pale yellow to cream, vitreous to pearly luster, translucent, and commonly rhombohedral cleavage. The specimen appears massive and irregular, with possible iron staining and a small blue surface inclusion or coating.
Identified More mineral →
Explore Calcite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Usually Mohs hardness 3; pale yellow to cream, vitreous to pearly luster, translucent, and commonly rhombohedral cleavage. The specimen appears massive and irregular, with possible iron staining and a small blue surface inclusion or coating.
Formation & geological history
Forms in limestone, marble, hydrothermal veins, caves, and evaporite environments through precipitation or recrystallization. Calcite occurs from Precambrian to Recent ages and is widespread globally.
Uses & applications
Used to manufacture cement, lime, and agricultural soil additives; clear optical calcite is collected, while attractive honey calcite is used as a lapidary and display material.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid or vinegar, unlike quartz. It shows strong double refraction in clear pieces and is a principal mineral of limestone.
Field identification & locations
Identify it by its softness, rhombohedral cleavage, and acid reaction; a copper coin or steel blade can scratch it. Common localities include Mexico, Iceland, the United States, China, and Morocco.
