By Kimberley Kao and Fabiana Negrin Ochoa

The U.S. has inked a rare-earths and strategic minerals agreement with India to deepen collaboration on the materials that power everything from cars to artificial intelligence.

U.S. Secretary of State Marco Rubio signed the framework agreement during a visit to India, calling it a "tangible example" of the partnership between the two sides.

"We are two countries that have strategic interests in ensuring reliable long-term access to critical minerals and supply chains that are important for our innovation economy," Rubio said Tuesday.

The pact came on the sidelines of talks between Rubio and the foreign ministers of Australia, India and Japan--a grouping known as the "quad" that focuses on a free and open Indo-Pacific.