<?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">metamorphic rock</topic></authority><related type="narrower"><topic>jade</topic></related><related type="narrower"><topic>lapis lazuli</topic></related><related type="narrower"><topic>gneiss</topic></related><related type="narrower"><topic>hornfels</topic></related><related type="narrower"><topic>marble</topic></related><related type="narrower"><topic>phyllite</topic></related><related type="narrower"><topic>quartzite</topic></related><related type="narrower"><topic>schist</topic></related><related type="narrower"><topic>slate</topic></related><related type="narrower"><topic>soapstone</topic></related><related type="narrower"><topic>serpentinite</topic></related><related type="narrower"><topic>eclogite</topic></related><related type="broader"><topic>rock</topic></related><variant type="other"><topic>metamorphic rocks</topic></variant><variant type="other"><topic>metamorphic stone</topic></variant><variant type="other"><topic>rock, metamorphic</topic></variant><variant type="other"><topic>rocks, metamorphic</topic></variant><variant type="other"><topic>stone, metamorphic</topic></variant> <note xml:lang="en"><![CDATA[ Rocks that result from the alteration of pre-existing rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. The pre-existing rocks may be igneous, sedimentary, or other metamorphic rocks. ]]></note></mads>