Delvauxite
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Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass. Its chemical formula is CaFe4(PO4,SO4)2OH ⋅ xH2O. It may sometimes form stalactites.
Found in Bernau, Liege, Belgium and Stredocesky, Czech republic.
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