Iron

Iron is a raw material introduced with the Iron Age, along with Carbon.

Iron is used in the production of the following items:
 * Silicon
 * Steel
 * Magnet
 * Integrated Circuit
 * Internet
 * Broadcast Tower
 * Exercise Machine
 * Compass
 * Vladimir Putin's Gym Shorts
 * Reddit Moderators
 * EMP That Only Resets Clocks
 * Gun That Shoots Laser Guns
 * Firewall That Makes All Porn Have Realistic Writing
 * Convince Everyone Livejournal Is Cool Again
 * GPS
 * ICBM Missile
 * All Actors Replaced By Jeff Bridges
 * Carrot Top's Exercise Videos
 * Katana Launcher