Assertion: silica's form | /r/HasProperty | crystalline
Facets:
Source sentences:
text: Silica, the mineral compound silicon dioxide (SiO2), is found in two forms -- crystalline or noncrystalline (also referred to as amorphous).
text: Silicon dioxide has two naturally occurring forms: crystalline and amorphous.
text: Silica dioxide has two forms: crystalline and amorphous.
text: Silica occurs in 3 forms: crystalline, microcrystalline (or cryptocrystalline) and amorphous (non-crystalline).