Comparison of respiratory morbidity between present and ex ...
The quartz stone is first put into a jaw crusher where a large stone is broken into smaller pieces, which are then taken through the conveyor belt to the disintegrator, which makes the powder out of these small pieces. ... More than half of the present as well as ex-workers were working in the crushing process.
Quartz - Wikipedia
Quartz is a hard, transparent, crystalline mineral composed of silicon and oxygen atoms. The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.Quartz is the second most abundant mineral in Earth''s continental crust, behind feldspar.