Zentora

Zentora is a rare, naturally occurring gemstone found in volcanic regions. They are pale blue in color, varying in opacity. Their most notable feature is that when two crystals are moved past one another, they resist the movement and convert the kinetic energy into a thermal delta. The scale, magnitude, and direction of the delta is correlated respectively with the size, speed, and orientation of the crystals.

Usage

While their use for heating is rather limited, their ability to produce cold temperatures has garnered them wide industrial application, from food refrigeration to cooling buildings during hot weather.