<?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">melanterite</topic></authority><related type="broader"><topic>mineral</topic></related><variant type="other"><topic>copperas</topic></variant><variant type="other"><topic>green copperas</topic></variant><variant type="other"><topic>green vitriol</topic></variant><variant type="other"><topic>iron vitriol</topic></variant><variant type="other"><topic>melantherite</topic></variant> <note xml:lang="en"><![CDATA[ Melanterite is hydrated iron sulfate formed after decomposition of pyrite or other iron materials by action of surface waters in mines. It occurs as dull, translucent green crystals on mine walls. Formerly used to make an inky pigment, melanteria. ]]></note></mads>