Windalia Radiolarite is a fine-grained, silica-rich sedimentary rock found in Western Australia’s Carnarvon Basin. Composed primarily of radiolarian microfossils, it is characterized by its high silicon dioxide content, making it a valuable natural resource. Its origin dates back to the Cretaceous period, with layers formed from the accumulation of microscopic marine organisms. The high silica content in Windalia Radiolarite provides unique properties that make it a sought-after material in industries like construction, horticulture and agriculture.

In concrete production, the inclusion of Windalia Radiolarite offers several benefits. Its fine, amorphous silica content contributes to the pozzolanic reaction in cement, enhancing the material’s strength and durability. This reaction helps to improve the concrete’s resistance to cracking, shrinkage, and other common degradation processes. Additionally, Windalia Radiolarite reduces permeability, making the concrete more resistant to water penetration and, consequently, to chemical attack. These properties make it a sustainable and cost-effective additive for improving the long-term performance of concrete structures.

←  screenshot (1/50th of a mm across !) of the amazing structure and the actual fossil that gives the mineral it’s massive specific surface area and therefore it’s phenomenal capabilities.