<?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">apatite</topic></authority><related type="other"><topic>phosphorus</topic></related><related type="other"><topic>phosphorite</topic></related><related type="other"><topic>calcium phosphate</topic></related><related type="broader"><topic>mineral</topic></related><related type="broader"><topic>gemstones by specific type</topic></related> <note xml:lang="en"><![CDATA[ Naturally occurring mineral of calcium fluor-phosphate; numerous deposits are found in Germany, Spain and North America. It is colorless when pure, but impurities can give it a white, green (asparagus stone), blue (moroxite), yellow, or violet color. Bones are composed of hydroxyapatite, mixed with protein (ossein) and small amounts of other minerals, such as calcium carbonate. Apatite is commercially used as a fertilizer. ]]></note></mads>