Assertion: free silica | /r/HasProperty | quartz
Facets:
Source sentences:
text: A detailed analytical method for free silica (quartz) is in the NIOSH Manual of Analytical Methods, 2nd Ed., Vol. 5, 1979 as method #259.15
text: ; quartz is a "free silica," but not all "free silica" is quartz.
text: The term, "free silica" is often used loosely to refer to quartz; quartz is a "free silica," but not all "free silica" is quartz.