Archerite was a fictitious mineral invented as a ruse by Andorian Commander Shran, purportedly of great value to the Andorian Mining Consortium. 

Its one-time mention came In late 2153, as Shran, while assisting the crew of the Enterprise NX-01 in capturing a Xindi superweapon prototype, attempted to pass off his warship Kumari as a mining scout searching for a rare mineral in the Calindra system – the testing area of the Xindi weapon. When questioned by the skeptical Xindi, he had to think quickly of a name for this supppsed mineral. He glanced at Enterprise Captain Jonathan Archer and came up with the name "Archerite". This attempted deception was was not accepted, and the Xindi forced the Kumari to leave the system, though not in time to prevent it from gathering valuable technical scans of the weapon. (ENT: "Proving Ground")