Synthetic calcareous pseudomorphs formed from siliceous microstructures.
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.
Harker
R I
RI