AAA quality, rare find translucent perfect bullseye yellow Aragonite stalactite slice. Polished on front and rear sides. Aragonite is a naturally occurring polymorph of calcium carbonate which differs from calcite in its crystal lattice structure. A delicate coral-like form of Aragonite is known as Flos Ferri, and the more common twinned hexagonal prismatic forms are known as Aragonite Sputnik.