Brimstone Secured Partnerships for Mineral-Rich Cement

Construction and manufacturing firms should monitor new domestic pathways for cement and critical mineral sourcing.

Updated on Oct. 6, 2026 in Startups

Isometric editorial illustration of raw silicate rock fragments placed next to a smooth cement block. — Startup Brimstone has secured supply agreements with Amazon and Century Aluminum to commercialize a process that converts silicate rocks into cement and critical minerals. AI Illustration. Upload story photo >

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Is now a good time for the U.S. to prioritize domestic production of critical industrial minerals?

Startup Brimstone has secured supply agreements with Amazon and Century Aluminum to commercialize a process that produces cement and critical minerals from silicate rocks. The company's technology aims to provide a domestic supply chain for materials currently sourced from China.

Why it matters

The venture addresses supply chain vulnerabilities by creating a path for domestic production of steel, magnesium, and titanium. By utilizing silicate rocks instead of limestone, the process intends to mitigate the 8% of global CO2 emissions attributed to conventional cement production.

Brimstone's process seeks to capture a portion of the $2.4 trillion global market for construction materials and minerals, while operating under the shadow of a revoked $189 million federal grant for its Reno facility.

The players

Brimstone

An Oakland-based materials startup founded in 2019 focused on low-carbon cement and domestic mineral extraction.

Amazon

A global technology and logistics conglomerate with significant infrastructure and construction supply chain requirements.

Century Aluminum

A major American producer of primary aluminum that requires significant raw materials and industrial inputs.

The details

Brimstone utilizes a single refinery process to transform silicate rocks into multiple industrial outputs, including cement and smelter-grade alumina. By replacing limestone in cement production, the firm achieves a 60% decrease in greenhouse-gas emissions. The company earned industry certification for its Portland cement in 2023, validating the product for standard commercial construction applications.

Brimstone was founded in 2019.
The company earned industry certification for its Portland cement in 2023.
The firm showcased its capacity for producing smelter-grade alumina in early 2025.
The Reno cement and alumina facility is expected to begin operations in 2028.
Full-scale production of steel and titanium is projected for the next decade.

Market Landscape

Brimstone’s transition to private supply agreements follows a period of federal funding instability for green manufacturing projects. The strategy aligns with broader industry efforts to reduce dependency on Chinese mineral imports by localizing extraction and production.

Operators in the construction and manufacturing sectors should track the 2028 launch date for the Reno facility to evaluate potential shifts in raw material costs. Businesses should assess whether localized, low-carbon sourcing options align with their own supply chain ESG requirements.

The takeaway

The pivot to private partnerships signals that industrial startups are increasingly bypassing public funding to secure long-term demand from corporate buyers. Keep a close watch on 2028 production milestones as a bellwether for the viability of silicate-based mineral extraction at scale.