<?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">boron</topic></authority><related type="broader"><topic>inorganic material</topic></related><related type="broader"><topic>elements</topic></related><variant type="other"><topic>B</topic></variant> <note xml:lang="en"><![CDATA[ Non-metallic solid element, atomic number 5, symbol B, with several specialized uses, such as in alloy steels, in semiconductors, and in commercially valuable compounds such as borax and boric acid. It is usually prepared as a brown powder, but when very pure it forms hard, shiny, dark crystals. ]]></note></mads>