Assertion: mica | /r/HasProperty | natural
Facets:
Source sentences:
text: Are micas considered natural?
text: Mica (Natural): Jason Christopher Willett, 2013 Mineral Commodity Summary, United States Geological Survey, January 2013.
text: You're well adviced to remember that mica is a natural product.
text: The majority of Bramble Berry’s micas contain only mica and iron oxides, which both readily occur in nature and can be considered natural.