The Rare Geology Behind Amlan’s High-Performance Clay
Beneath the surface of Amlan’s mineral reserves lies a geological rarity that distinguishes it from clay deposits found anywhere else on Earth. Situated near the northernmost reaches of the ancient Porters Creek Formation, these selectively mined clays are more than remnants of deep time—they’re the product of a complex, low-energy marine environment that existed nearly 60 million years ago. Shaped by ocean incursions, anoxic waters, and evolving sediment chemistry, this unique deposit has given rise to something truly important. Within its ancient layers, calcium-montmorillonite and opal-CT lepispheres naturally intertwine to form a sorbent material with nano-scale porosity and unparalleled adsorption capabilities.
Hidden Deep in Time
Amlan’s unique mineral deposits lie near an expansive clay system that spans multiple states and is considered one of the largest of its kind in the world.
FIGURE 1.
The clay was deposited during the Paleocene in a saline, anoxic paleoenvironment similar to conditions present in a modern seashore river delta. During that period, the ocean transgressed over this region termed the “Mississippi Embayment”.
The clays (or phyllosilicates) are predominantly composed of Smectite mineral of detrital origin (such as Ca-montmorillonite), along with other minor or trace constituents including illite, kaolinite/halloysite, quartz sand, mica, pyrite and K-feldspar. Also of key importance, the authigenic mineral Opal-CT is present in large amounts in some areas. Opal-CT precipitated from silica-saturated pore waters formed as a result of the dissolution of diatoms (the skeletons of siliceous marine organisms called plankton) co-deposited long ago with these detrital minerals.
Amlan’s sorbents are bentonite materials that contain a large amount of micropores which are distributed inside the individual mineral particles comprising granules. Hence processed binding sites for the complexation of molecules are contained within their interconnected porous system. This unique nano-scale material is composed of other Opal-CT minerals whose collective microstructures (seen in the Opal Lepisphere image provided below) and unique surface chemistry characteristics enhance the special physical properties displayed by it. For instance, natural opal lepispheres are a special geogenic mineral intimately interwoven with the nano-scale montmorillonite tactoids forming the bentonite. This “structural fabric” maintains its interconnected porosity during the thermal processing used to make Amlan’s feed additives. In addition, the opal lepisphere structures themselves create more pores, enhancing the binding sites that can be accessed.
Figure 2. Unique Montmorillonite & Opal-CT Minerals
At the atomic and nano scales, montmorillonite is built from a repeating arrangement of silica tetrahedra and aluminum octahedra—fundamental building blocks organized into 2:1 layered sheet structures that define this phyllosilicate mineral. In nature, these layers often undergo elemental substitutions. For example, when a silicon atom (normally surrounded by four oxygen atoms with a neutral charge) is replaced by an aluminum atom during clay formation, the charge balance is disrupted. Because aluminum carries only three positive charges, the substitution creates an extra negative charge within the structure. When this charge is balanced by a proton (H⁺), it forms what’s known as an ‘acid site.’ These acid sites, combined with the extensive micro- and nano-scale porosity within the clay, are key contributors to its strong adsorption properties.
This intricate atomic structure—paired with the naturally embedded opal-CT lepispheres—sets Amlan’s clay apart. It’s this rare and highly functional mineral foundation that enables the superior performance of Amlan’s solutions, forming the basis for high-efficiency products built on the strength of geological precision.
A Geological Foundation for Performance
Amlan’s clay stands out not by chance, but due toa rare geological environment that shaped it millions of years, coupled with Amlan’s proprietary thermal processing, is what makes it unique. This bentonite clay features a unique blend of calcium-montmorillonite and opal-CT, with a naturally porous structure at the micro- and nano-scale. These characteristics aren’t just scientifically interesting, they directly contribute to the superior performance of Amlan’s sorbent technology. From exceptional adsorption capacity to structural integrity during processing, this clay’s natural architecture delivers reliable, high-functioning solutions across a range of applications. It’s not just clay—it’s a rare geological advantage engineered by nature and optimized by Amlan.
