Aragonite is a polymorph of calcium carbonate (same chemical composition but different crystal form) with orthorhombic crystal system. Repeated twinning results in pseudo-hexagonal forms. Aragonite may be columnar or fibrous, occasionally in branching helictitic forms called flos-ferri “flowers of iron”. A cave dwelling mineral, it often forms coral-shaped structures. Aragonite grows in varied forms such as fibrous masses, as coral-like structures, or as banded stalactites. Although usually white in color, the color varies from yellowish, reddish, greenish, purplish, bluish, or gray depending on other minerals that formed with it. Under UV illumination, it often displays bright pink fluorescence. It is believed to promote emotional stability, reduce stress and anxiety, enhance focus and patience, and healing of bones and joints.