<?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">obsidian mirrors</topic></authority><related type="other"><topic>obsidian</topic></related><related type="broader"><topic>mirrors by form</topic></related><variant type="other"><topic>obsidian mirror</topic></variant><variant type="other"><topic>tezcatl</topic></variant> <note xml:lang="en"><![CDATA[ Mirrors made from polished obsidian, which is a dark, shiny glass formed in nature by the rapid cooling of lava. Such mirrors were used since Paleolithic times. In ancient Mesoamerica and elsewhere, they were often used as instruments for seeing. ]]></note></mads>