Brimstone Secured Partnerships for Mineral-Rich Cement
The startup uses silicate rock to extract critical minerals while cutting cement-related carbon emissions by 60%.
Updated on Oct. 6, 2026 in Startups
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Founded in 2019, Brimstone has developed a process to extract critical minerals and produce Portland cement from silicate rocks rather than limestone. The company recently finalized supply agreements with Amazon and Century Aluminum as it advances toward commercial production.
Why it matters
The company seeks to establish a domestic supply chain for essential industrial materials, aiming to provide an alternative to goods currently sourced from China. This shift focuses on reducing reliance on overseas manufacturing while simultaneously targeting the 8% of global carbon dioxide pollution generated by traditional cement production.
Brimstone has achieved third-party industry certification for its Portland cement, which generates 60% fewer emissions than the industry standard. The process uses silicate rocks in a single refinery to simultaneously produce cement, steel, magnesium, titanium, and smelter-grade alumina.
The players
Brimstone
An Oakland-based startup developing mineral extraction and low-carbon cement production technologies.
Amazon
A global technology and logistics corporation currently securing supply agreements for sustainable materials.
Century Aluminum
A primary aluminum producer that is contracting with Brimstone to secure domestic supplies of critical industrial minerals.
The details
The process uses silicate rocks as a chemical feedstock to produce multiple high-value materials in a single refinery. By moving away from limestone—a sedimentary rock primarily made of calcium carbonate—the company bypasses the carbon-heavy calcination process that accounts for 8% of global carbon dioxide output. This methodology produces cement while yielding critical minerals like alumina, steel, magnesium, and titanium as output streams.
Timeline
Brimstone was founded in 2019.
The company earned industry certification for its Portland cement in 2023.
Brimstone confirmed its capacity to produce smelter-grade alumina in early 2025.
Operations at the Reno facility are expected to begin in 2028.
Full-scale production of steel and titanium is projected for the next decade.
The Tech Race
The company's commercial trajectory faces a setback following the revocation of a $189 million government grant for its Reno demonstration project. Despite this, the firm continues to compete against established Chinese supply chains in the $2.4 trillion global market for industrial minerals.
The startup's technology targets industrial partners first, aiming to supply sustainable construction materials and minerals to manufacturers like Amazon and Century Aluminum. Commercial availability for broader building and industrial sectors remains dependent on the planned 2028 facility launch.
The takeaway
Brimstone is attempting to decouple heavy industrial production from high carbon emissions and overseas supply dependencies. Readers should monitor the startup's ability to reach full operations at the Reno facility in 2028, which will serve as the primary indicator of the technology's scalability.
Further reading
For more on the latest developments in materials science, visit Startups.
Source note: This article includes information reported by MIT Technology Review.
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