Brass

Brass was an alloy of copper and zinc.

Applications
Decorative items, moving metal parts (locks, gears, valves etc.), musical instruments (for acoustic properties).

The find familiar spell requires a brass brazier for casting the spell.

A ring of dragons, purple dragon ring, and staff of entrapment were all made of brass.

Currency

 * The Waterdhavian taol worth 2 gp in Waterdeep, but little elsewhere.
 * Gond bells worth 10–20 gp.