<?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">chalcedony</topic></authority><related type="narrower"><topic>agate</topic></related><related type="narrower"><topic>onyx</topic></related><related type="narrower"><topic>bloodstone</topic></related><related type="narrower"><topic>chrysoprase</topic></related><related type="narrower"><topic>jasper</topic></related><related type="narrower"><topic>carnelian</topic></related><related type="narrower"><topic>sard</topic></related><related type="broader"><topic>quartz</topic></related><related type="broader"><topic>gemstones by specific type</topic></related><variant type="other"><topic>calcedony</topic></variant> <note xml:lang="en"><![CDATA[ A translucent, quartz usually  with a waxy luster, having tiny microscopic crystals that are sometimes arranged in slender fibrous bands; occurring in various colors, usually red, blue, or green. ]]></note></mads>