"Brimstone is working to create the industrial processes of the 21st century, leveraging co-production to unlock the economic value of common, domestically sourced rocks. “This milestone is a ...

California-based startup Brimstone announced last week that its process to create low-carbon cement and concrete ingredients could also produce smelter-grade alumina out of common rocks.

The U.S. imports lots of alumina, which is a key component of aluminum. Brimstone says it can produce the ingredient ...