mineral
Calcite in Basalt
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, transparent to white color, vitreous to pearly luster, rhombohedral cleavage, specific gravity of 2.71.
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Physical properties
Hardness 3 on the Mohs scale, transparent to white color, vitreous to pearly luster, rhombohedral cleavage, specific gravity of 2.71.
Formation & geological history
Formed through low-temperature hydrothermal precipitation or secondary crystallization within vesicles and fractures of basic igneous rocks like basalt.
Uses & applications
Used in educational collections, aggregate, and chemical manufacturing, though crystallized specimens are prized by mineral collectors.
Geological facts
Calcite exhibits strong double refraction (birefringence), splitting light into two separate rays. It strongly effervesces when exposed to dilute hydrochloric acid.
Field identification & locations
Easily identified by its characteristic rhombohedral cleavage, softness (scratched with a copper coin), and acid reaction. Commonly found worldwide in cavities of basaltic lava flows.
