A piece of quartz, which is a very common mineral and is in your rock set, is 7.
(A piece of quartz; is; a very common mineral) (A piece of quartz; is; in your rock set) (A piece of quartz, which is a very common mineral and is in your rock set; is; 7)
A piece of quartz A piece of quartz A piece of quartz, which is a very common mineral and is in your rock set
is is is
a very common mineral
in your rock set
7