Synthetic Calcareous Pseudomorphs Formed from Siliceous Microstructures

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Science  16 Jul 1971:
Vol. 173, Issue 3993, pp. 235-237
DOI: 10.1126/science.173.3993.235


Individuals of the diatom Coscinodiscus have been treated hydrothermally in the presence of lime and carbon dioxide with the result that they have been pseudomorphed by calcite. The silica of the original diatoms has been replaced while the intricate reticulations of the alveoli have been preserved down to submicroscopic detail.