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 very attractive crystals that are often grown together in clusters. Mines such as the one at Tintic,Utah often contain spectacular specimens | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
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