Assertion: selenium | /r/HasProperty | prepared
Facets:
value: from flue dusts
type: OTHER
value: with an amorphous or crystalline structure
type: OTHER
value: from processing copper sulfide ores
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: Selenium exists in several forms, but is usually prepared with an amorphous or crystalline structure.
text: It has been prepared from flue dusts from processing copper sulfide ores, but the anode metal from electrolytic copper refineries is a more common source of selenium.