Assertion: periclase | /r/AtLocation | marble
Facets:
value: usually
type: DEGREE
value: sometimes
type: TEMPORAL
Source sentences:
text: Periclase is a natural magnesium oxide mineral sometimes found in marble.
text: Magnesium oxide is also found in marble produced by the metamorphism of limestone rock.
text: Periclase is usually found in marble produced by metamorphism of dolomitic limestones.