Assertion: slate | /r/HasProperty | occurring product
Facets:
value: naturally
type: MANNER
Source sentences:
text: Since slate is a naturally occurring product, different kinds of slate are subject to varying chemical and mineral compositions, determined largely by the geological characteristics of the quarry from which it was mined.
text: Slate is a naturally occurring stone material which is formed of compressed sedimentary particles of clay and silt built up on ancient sea beds.