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TITLE: Different Environments


[Photo: Different Forms of Gypsum]

[Photo: Different Forms of Gypsum]All these crystals are the same mineral: gypsum. They all have the same chemical composition and atomic arrangement. Why do they look so different? Impurities—or even slight changes in the concentration of the solution feeding the gypsum's growth—can trigger drastic differences in form.



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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits