Assertion: alumina | /r/HasProperty | al 2 o 3
Facets:
Source sentences:
text: In addition, they can be classified as either acidic (containing silica [SiO 2 ] or zirconia [ZrO 2 ]) or basic (containing alumina [Al 2 O 3 ] or alkaline-earth oxides such as lime [CaO] or magnesia [MgO]).
text: Both sapphires and rubies are corundum, a crystalline form of aluminium oxide (Al2O3).