<?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">zirconium</topic></authority><related type="other"><topic>zircon</topic></related><related type="broader"><topic>nonferrous metal</topic></related><related type="broader"><topic>elements</topic></related><variant type="other"><topic>Zr</topic></variant> <note xml:lang="en"><![CDATA[ Zirconium is a metallic element having symbol Zr and atomic weight 91.22. It is obtained from zircon and other minerals and is commercially the most important ore. A hard metal resistant to heat and corrosion, it is much used in nuclear reactors, in alloys, refractories, and ceramics. ]]></note></mads>