a carbonate mineral related to dolomite but with iron replacing part of the magnesium.

1835–45; named after M. J. Anker (died 1843), Austrian mineralogist; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ankerite (ˈæŋkəˌraɪt)
a greyish to brown mineral that resembles dolomite and consists of a carbonate of calcium, magnesium, and iron. Formula: (Ca,Mg,Fe)CO3
[C19: named after M. J. Anker (died 1843), Austrian mineralogist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The veins are usually zoned with sulfides on the walls and a center of comb quartz and ankerite.
Hornblende quartz monzonite is commonly altered to chlorite-ankerite-sericite with or without pyrite.
High levels of magnesium, which are common, probably derive from ankerite.
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