gdml_materials.gdml
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	Matthew Reid (mattreid9956)
	Nov 13 2013, 4:20 PM

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gdml_materials.gdml
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	<materials>
	<!-- Define some elements -->
	<element name="Nitrogen" formula="N" Z="7.">
	<atom value="14.01"/>
	</element>
	<element name="Hydrogen" formula="H" Z="1.">
	<atom value="1.008"/>
	</element>
	<element name="Silicon" Z="14" formula="Si">
	<atom value="28.085" />
	</element>
	<element name="Oxygen" Z="8" formula="O">
	<atom value="16" />
	</element>
	<element name="Iron" Z="26.0" formula="Fe">
	<atom value="55.847"/>
	</element>

	<!-- Define some materials -->
	<material name="Vacuum">
	<D type="density" unit="g/cm3" value="0.00000001" />
	<fraction n="1" ref="Hydrogen" />
	</material>
	<material name="SiliconOxide" formula="SiO2">
	<D value="1.0"/>
	<composite n="1" ref="Silicon"/>
	<composite n="2" ref="Oxygen"/>
	</material>
	<material name="Water" formula="H2O">
	<D value="1.0"/>
	<composite n="2" ref="Hydrogen"/>
	<composite n="1" ref="Oxygen"/>
	</material>
	<material name="Aluminium" Z="13.0">
	<D value="2.70" />
	<atom value="26.98"/>
	</material>
	<material formula=" " name="Air">
	<D value="1.290" unit="mg/cm3"/>
	<fraction n="0.7" ref="Nitrogen"/>
	<fraction n="0.3" ref="Oxygen"/>
	</material>
	</materials>