mineral

Polished yellow calcite pendant

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Opaque to translucent pale honey-yellow stone with a polished surface and vitreous-to-waxy luster; calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The pendant’s exact mineral identity cannot be confirmed from appearance alone.

Identified October 2, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary, hydrothermal, and metamorphic settings, including limestone and marble; it commonly precipitates from calcium-rich water. Its geological age depends on the source deposit.

Uses & applications

Polished calcite is used for ornaments and inexpensive jewelry; calcite is also an important industrial source of lime and a major component of cement and aggregate.

Geological facts

Calcite fizzes in dilute hydrochloric acid and is distinctly softer than quartz, but these tests should not be performed on a finished pendant.

Field identification & locations

Yellow calcite is found in deposits worldwide, including Mexico, Brazil, and the United States. A glassy polish and uniform color are consistent with calcite, though similar stones such as quartz or dyed material can look alike.