Aragonite and calcite are both composed of calcium carbonate,but the two minerals have different crystallographic structures. Aragonite is the substance of pearls,while calcite typically makes up the shells of mollusks. Aragonite is extremely common and widespread,and forms both crystals and branching growths that are described with the term 'corraloidal' (i.e. branching like a coral formation). This material is sometimes called 'flos feri' aragonite,and is typically found in caves. The specimens from Styria,Austria are classic examples of flos feri growth | |
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