<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">vivianite</topic></authority><related type="other"><topic>ferrous phosphate</topic></related><related type="broader"><topic>mineral</topic></related> <note xml:lang="en"><![CDATA[ Mineral comprising naturally occuring ferrous phosphate. Vivianite was described after discovery in the St. Agnes mine in Cornwall in 1817. Used in the pigment "blue ocher"; has been found in Roman paint residues. Ferrous phosphate is used as a colorant in ceramics. ]]></note></mads>