There is no specific type of rock that can inherently change electromagnetic energy around it. Rocks are composed of minerals and do not possess the ability to alter electromagnetic fields or energies on their own.
However, certain minerals and crystals, when properly utilized, can interact with electromagnetic fields. This phenomenon is known as piezoelectricity and is not exclusive to rocks but is observed in various materials. Piezoelectric materials generate an electric charge when subjected to mechanical stress or pressure, and they can also exhibit the reverse effect by deforming when an electric field is applied to them.
Quartz is a commonly known mineral with piezoelectric properties. It can be found in various types of rocks and is often used in electronic devices, such as watches, due to its ability to generate a small electrical charge when pressure is applied.
It's worth noting that while certain minerals may have piezoelectric properties, their effects on electromagnetic fields are generally small and localized. They are not capable of significantly altering or manipulating electromagnetic energy on a large scale.