a carbonate mineral related to dolomite but with iron replacing part of the magnesium.
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British Dictionary definitions for ankerite
a greyish to brown mineral that resembles dolomite and consists of a carbonate of calcium, magnesium, and iron. Formula: (Ca,Mg,Fe)CO 3
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012