mineral
Calcite on Limestone
Calcium Carbonate (CaCO3)
Hardness of 3 on Mohs scale; rhombohedral crystal habit; white to tan color with vitreous to pearly luster; characteristic perfect cleavage in three directions.
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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.
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