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Trébeurdenite
A valid IMA mineral species
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![](#"/photo-697566.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f51%2f14%2f05026150017272472203399.jpg&f=jpg&w=240" alt="05026150017272472203399.jpg" /></a><div><b>The town of Trebeurden.</b><br /><br /><a href="/mt/?noimg=&dark=on&url=https%3a%2f%2fwww.mindat.org%2floc-245172.html">Île Aval, Penvern, Pleumeur-Bodou, Lannion, Côtes-d){kind=link}
Formula:
Fe2+2Fe3+4O2(OH)10CO3 · 3H2O
Colour:
grey-green
Lustre:
Earthy
Crystal System:
Trigonal
Member of:
Name:
Named for the township of Trebeurden, near the maritime marsh where the mineral was first found.
The mineral formerly described as fougèrite has been found to be an intimate intergrowth of two phases with distinct Fe2+:Fe3+ ratios. The phase with Fe2+:Fe3+ = 2:1 retains the namefougèrite; that with Fe2+:Fe3+ = 1:2 is defined as the new species trébeurdenite. Both belong to theFougèrite Group (Mills et al., 2012).