Diamagnetic ore
Diamagnetic ore is a diamagnetic mineral high in energy yield.

Diamagnetic ore caused sensor readings similar to those of an atmospheric electrical storm or an industrial facility might produce. ()

In addition, these diamagnetic minerals, which can be found in igneous rocks, also produce diamagnetic fields that interfered with the normal operation of many technological devices such as communicators. () 

The planetary rings of a planet in which  attempted to evade a Klingon  battle cruiser included the fairly typical composition of methane ice, isolytic plasma, and diamagnetic dust. ()

See also
 Diamagnetic storm
Materials