The Iron Ore Quark

Putting the Thimble on one's pinky finger activates the protective powers. The Iron Ore Quark in in side the thimble's button. The interior houses a button, that, when pressed by a pinky finger, activates a DNA scan determining the wearers true motives. If they are pure of heart, the armor will open. The suit is stored in the Thimble, making it mad heavy.
The Iron Ore Quark was hidden within The Thimble.
The Iron Ore Quark is one of the six Quarks used in the Infinity Gauntlet.