Assertion: silica's form | /r/HasProperty | polymorph
Facets:
Source sentences:
text: Crystalline silica exists in seven different forms (polymorphs), four of which are very rare.
text: These forms are called polymorphs.
text: Crystalline silica exists in 7 different forms (polymorphs), depending upon the temperature of formation.
text: exists in 7 different forms (polymorphs), depending upon the temperature of formation.