<?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">fused silica glass</topic></authority><related type="broader"><topic>glass by composition or origin</topic></related><variant type="other"><topic>fused quartz</topic></variant><variant type="other"><topic>glass, fused silica</topic></variant><variant type="other"><topic>quartz glass</topic></variant><variant type="other"><topic>silica glass</topic></variant><variant type="other"><topic>silica glass, fused</topic></variant> <note xml:lang="en"><![CDATA[ One of the most transparent and heat-resistant of all glasses and is 100% silicon dioxide. ]]></note></mads>