Brass

Brass is a metal alloy, a combination of copper and zinc.

Joaquin Weiss wore a large brass belt buckle shaped like the head of a snarling grizzly bear. 

In 2269, during the battle between Spock and Spock One on Organia, Captain James T. Kirk (due to the effects of the thought-shield) saw Spock as a statue made of red-hot brass.