Complete text: '' quartz and a handful of other less common minerals are piezoelectric , a property in which the crystal can create electrical energy or rf signals when properly stimulated . i know the first cb radios contained slices of quartz tuned to transmit and receive the radio frequencies they operated on , '' mr. swartz replied . '' that 's really interesting . i did n't know quartz could do that , '' matt remarked . '' you would have to talk to a physicist who specializes in electromagnetics to confirm whether or not your sample is unique , but it sounds like it might be piezoelectric , '' mr. swartz added as he handed it back to
matt