Article
Article
Ankerite
Article By:
Gaines, Alan M. Division of Earth Science, National Science Foundation, Washington, DC.
Last reviewed:October 2019
DOI:https://doi.org/10.1036/1097-8542.036500
The carbonate mineral Ca(Fe,Mg)(CO3)2, also commonly containing some manganese. The mineral has hexagonal (rhombohedral) symmetry (see illustration) and has the cation-ordered structure of dolomite. The name is applied only to those species in which at least 20% of the magnesium positions are occupied by iron or manganese; species containing less iron are termed ferroan dolomites. The pure compound, CaFe(CO3)2, has never been found in nature and has never been synthesized as an ordered compound. See also: Dolomite
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