'Flint is a fine-grained variety of this mineral used in crystal-controlled clocks & watches'
quartz
MEET THE FLINT STONES: Flint is a fine-grained variety of this mineral used in crystal-controlled clocks & watches
Flint is a fine-grained variety of this mineral used in crystal-controlled clocks & watches
Flint is a fine-grained variety of this mineral used in crystal-controlled clocks & watches
MEET THE FLINT STONES
quartz
MEET THE FLINT STONES