Cermet Chunk  

Cermet is an abbreviation for "CERamic" and "METal." CerMet is a composite material composed of ceramic (cer) and metallic (met) materials. The metal is used as a binder for an oxide, boride, carbide, or alumina. Generally, the metallic elements used are nickel, molybdenum, and cobalt. Depending on the physical structure of the material, cermets can also be metal matrix composites, but cermets are usually less than 20% metal by volume.

It is used in the manufacture of resistors (especially potentiometers), capacitors, and other electronic components which may experience high temperatures.

Some types of cermet are also being considered for use as spacecraft shielding as they resist the high velocity impacts of micrometeoroids and orbital debris much more effectively than more traditional spacecraft materials such as aluminum and other metals.

{Source: http://en.wikipedia.org/wiki/Cermet }

Hmmm.. And I thought this was just another made up SciFi/Fantasy material like Mythril.

a stack of these currently goes for 50k on diabolos