Limonite is a clayey silt found in wet sub-tropical and tropical climates, and is the product of the deep weathering of rock. Its high porosity, and the wet climatic conditions it forms under, gives it a very high in situ moisture content, which at depth often exceeds its Liquid Limit. The compaction characteristics of Limonite are a function of its initial moisture content and sample preparation. Limonite readily becomes untraffickable, and is difficult to compact. Limonite has a highly variable peak undrained shear strength, a much reduced remoulded shear strength, and a very high drained friction angle. It has structure (fissures) at every scale, resulting in a high hydraulic conductivity. This paper presents the unusual geotechnical parameters and behaviour of Limonite
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