blister copper

noun Metallurgy.
a matte of from 96 to 99 percent copper, having a blistered surface after smelting because of gases generated during solidification.

Origin:
1860–65

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World English Dictionary
blister copper
 
n
an impure form of copper having a blister-like surface due to the release of gas during cooling

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Blister copper is fire refined in reverberatory or rotary furnaces known as
  anode furnaces.
It is recovered commercially from anode muds produced during the electrolytic
  refining of blister copper.
These imports include partially smelted matte and crude anode or blister copper.
The blister copper from the converter is then refined by either fire or
  electrolytic methods.
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