Article I, Section 10, Clause 1
To wit:
"No State shall enter into any Treaty, Alliance, or Confederation; grant Letters of Marque and Reprisal; coin Money; emit Bills of Credit; make any Thing but gold and silver Coin a Tender in Payment of Debts; pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility."
Coin Money. But we can can coin rare-earth minerals, No, we can’t.
This is a most interesting vaunt, what we can and can’t coin, base on what metals we have.
Thank you again for your instructed posts.