Aragonite is polymorphous mineral with the same composition as calcite and vaterite but differing crystal structure. It can be found in several forms such as columnar crystals to wondrous branching, coral-like structures called flos-ferri, or flowers of iron, to most recognizably the iridescent naquer of pearls. Apart from its aesthetic qualities it is considered an essential part of aquariums to replicate natural reef environments as many marine organisms form their shells and skeletal structures from it.
These tumble stones are .75" x .75".
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