<?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">calcium oxalate</topic></authority><related type="narrower"><topic>whewellite</topic></related><related type="other"><topic>weddellite</topic></related><related type="broader"><topic>mineral</topic></related><variant type="other"><topic>calcium oxalates</topic></variant><variant type="other"><topic>oxalate, calcium</topic></variant> <note xml:lang="en"><![CDATA[ A salt of oxalic acid, calcium oxalate can form naturally on calcareous stones as a reaction to oxalic acid excretions of mosses and lichens. In a conservation context, calcium oxalate is generally considered in its role as a form of bioterioration but its cultivation as a protective film for limestone surfaces has been investigated as well. ]]></note></mads>