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"[Science fiction is] nightmares and visions, always outlined by the barely possible."
- Gregory Benford

Durachrome  
  Very hard alloy for tanks.  

A team on the left, the western bank, of the river opened up with a four-barreled heavy machine gun ~intended for antiaircraft use. They were good; the stream of half-ounce bullets hosed over the Mark III's armor like a river of green-tracer fire arching into the night. The sparks where the projectiles bounced from the density-enhanced durachrome were bright fireflies in the night. Where the layer of softer ablating material was still intact there was no spark, but a very careful observer might have seen starlight on the metal exposed by the bullets' impact.
From Honor of the Regiment, by Keith Laumer.
Published by Baen Books in 2002
Additional resources -

Compare to plasteel from Dune (1965) by Frank Herbert.

Thanks to Fortigurn for his suggestion.

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