Aragonite crystal fans in 3D

Aragonite crystal fans in three dimensional view, with pseudo-hexagonal sections in the surface where the coin is resting and prismatic sections in the side cut. Those beautiful crystals are precipitated directly on the seafloor when the ocean is supersatured in CaCO3. This happened ca. 630-540 million years ago, after a global glaciation created ice capsContinuar lendo “Aragonite crystal fans in 3D”