<?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">crystal</topic></authority><related type="other"><topic>flint glass</topic></related><related type="broader"><topic>lead glass</topic></related><variant type="other"><topic>crystal glass</topic></variant><variant type="other"><topic>high-lead crystal glass</topic></variant><variant type="other"><topic>lead crystal</topic></variant><variant type="other"><topic>lead crystal glass</topic></variant> <note xml:lang="en"><![CDATA[ Fine, high quality, heavy, decorative glass made with fine white sand, at least 24% lead oxide, and small amounts of potash and niter. It is clear, colorless, highly refractive glass that is heavy and has greater than twice the density of standard borate glass. It was developed in England in 1676; often used for high quality chandelier prisms and fine stemware. ]]></note></mads>