Travertine develops next-generation phosphate processing technology that produces purified phosphoric acid and cementitious materials from phosphate ore, replacing legacy methods that generate landfilled byproducts like phosphogypsum. The process transforms gypsum waste into calcium carbonate or slaked lime for concrete and cement production, while also yielding sulfuric acid for electrochemical extraction of critical elements including lithium, copper, and rare earth elements. It further enables permanent carbon dioxide removal by capturing CO2 from the air and sequestering it in minerals, with direct measurement for monitoring, reporting, and verification. Purified phosphoric acid serves fertilizer production, the food and beverage industry, water treatment, and lithium-iron-phosphate batteries for vehicles and grid storage. The technology draws inspiration from natural rock weathering cycles to eliminate sulfate byproducts and store CO2 in cement materials. Travertine targets the phosphate mining, fertilizer, cement, and critical minerals extraction industries. The company was founded by Laura Lammers, a former geochemistry professor at the University of California, Berkeley, and Owen Cadwalader, an environmental engineer and serial startup operator.