Assertion: silicon | /r/HasProperty | main element
Facets:
value: in quartz
type: LOCATION
value: in sand
type: LOCATION
Source sentences:
text: Silicon is a very common element -- for example, it is the main element in sand and quartz.
text: Silicon is a main ingredient in very low-tech creations, including bricks and ceramics.
text: Silicon, the main chemical element used in silicones, does not exist in a pure form naturally, but is found in the silicates in sand or rock form.