Assertion: calcium oxide's impurity | /r/HasProperty | iron
Facets:
value: especially
type: DEGREE
Source sentences:
text: It often appears with a yellowish or brownish tint to the presence of impurities, especially iron.
text: It frequently appears with a yellowish or brownish shade because of presence of impurities, particularly iron.
text: It often appears with a yellowish or brownish tint to the presence of impurities, especially iron.