mineral

Calcite on Limestone

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness of 3 on Mohs scale; rhombohedral crystal habit; white to tan color with vitreous to pearly luster; characteristic perfect cleavage in three directions.

Identified July 18, 2026More mineral →

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Physical properties

Hardness of 3 on Mohs scale; rhombohedral crystal habit; white to tan color with vitreous to pearly luster; characteristic perfect cleavage in three directions.

Formation & geological history

Formed through chemical precipitation in sedimentary environments or hydrothermal veins. This specimen likely developed as crystals grew into a cavity or 'vug' within a limestone matrix.

Uses & applications

Used primarily as a decorative mineral specimen, in the production of cement, for soil neutralization in agriculture, and as an ore of calcium.

Geological facts

Calcite is one of the most common minerals on Earth. It is the primary component of stalactites and stalagmites in caves and will react by bubbling (effervescing) if exposed to weak acids like vinegar.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper penny) and its reaction to dilute HCl. It is commonly found in sedimentary basins and limestone quarries globally.