Aragonitic

Aragonitic refers to a specific mineral polymorph of calcium carbonate (CaCO3). Polymorphs are minerals that share the same chemical formula but have different crystal structures. Aragonite is one of the three most common polymorphs of calcium carbonate, the others being calcite and vaterite. In aragonite, the calcium carbonate molecules are arranged in an orthorhombic crystal system, which gives it distinct physical properties compared to the trigonal system of calcite. Aragonite is typically harder and denser than calcite. It often forms in marine environments and is a major component of seashells, coral skeletons, and pearls. Aragonite is also found in some cave formations, such as stalactites and stalagmites, though calcite is more common in these settings. While aragonite is thermodynamically less stable than calcite at standard temperature and pressure, it can persist for long periods due to kinetic factors. Over geological time, aragonite will often transform into calcite. Its formation is influenced by factors such as temperature, pressure, and the presence of dissolved ions in water. The color of aragonite can vary, often appearing colorless, white, or pale yellow, but it can also be colored by impurities.