Assertion: magnesium | /r/HasProperty | the lightest metal
Facets:
Source sentences:
text: Magnesium is the lightest metal found in the world having a shiny grey colour with symbol Mg.
text: Magnesium is the lightest structural metal.
text: Magnesium is the lightest metal that can be used to build things, although its use as a structural material is limited since it burns at relatively low temperatures.
text: Magnesium is the lightest metal found on earth; it is four times lighter than steel and a third lighter than aluminum.