This gives a pretty good overview of how stones/crystals can work to absorb or release and amplify energy.Can you elaborate on "Psychic Amplifiers"? I tried to Google it but the links that were showing up are related to video games.
Some stone can also work as a "stone tape", one that captures energy and actually "plays it back" when it releases that energy.
The Stone Tape Theory | The Haunted Walk
By the late 20th century, belief in the Stone Tape Theory or residual hauntings was commonplace amongst paranormal investigators.
hauntedwalk.com