New challenges are facing an already tenuous market for semiconductors as China is making some changes in the name of national security.

As a key exporter of certain rare earth minerals that are critical to the production of some computer chips and solar panels, China holds the cards to a burgeoning market where semiconductors serve as the base of many electrical and electronic products.

But instead of selling them on the global market, China has pulled back. The country is reportedly responsible for the production of 80% of the world’s gallium and about 60% of germanium, says CNN - who cites the Critical Raw Materials Alliance. But recent curbs in the name of national security meant China exported none of it in the month of August.