are quartz rocks stronger than talc rocks?
Correct. Generally, quartz watches require batteries to power them. Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism (as used in automatic mechanical watches) to generate electricity with a piezoelectric quartz crystal as its timing element. Such movements aim to provide the advantages of quartz without the negative environmental impact of batteries. Several manufacturers employ this technique.
It has crystals not the gems of very good clocks.
