Assertion: aluminum | /r/HasProperty | al 2 o
Facets:
Source sentences:
text: Al 2 SiO 5 , (Al 2 O 3 .SiO 2 ), which occurs naturally as the minerals andalusite, kyanite and sillimanite which have different crystal structures.
text: Al 2 Si 2 O 7 , (Al 2 O 3 .2SiO 2 ), called metakaolinite, formed from kaolin by heating at 450 °C (842 °F).