$title Copper
Valued for its malleability and conductivity, copper is used in pipes and electrical components. It can be found below Y=48 about as commonly as iron.
$end
$title Nickel
Nickel is similar to iron in many ways, but is harder and tougher. It is useful as a pure metal, but can also be alloyed with iron or copper. It occurs uncommonly below Y=24.
$end
$title Monster Dust
This unsettling powder seems to be derived from monsters. Killing them by normal means does not yield any, but the Mob Disassembler can harvest one pile per monster processed.
It can be mixed with liquefied Glowstone to produce Energite.
$end
$title Energite
The reaction of Glowstone with Monster Dust produces substantial latent energy. It reacts strongly to electric current and magnetic fields, and is the key component of Energy Cores.
$end