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Coade stone has played a significant role in architectural and ornamental design since its inception in the early 18th century. It is well known that earlier, experimental, architectural stoneware products existed, but few of these have been studied in detail scientifically, and only one major analytical study of Coade stone has appeared in the literature. This paper presents a new spectroscopic analysis of Coade stone along with that of a newly discovered sample from Oxnead Hall in Norfolk where it known that Sir Clement Paston experimented with artificial stone in the late 16th century. The results demonstrate that it is possible to differentiate between the two variants on the basis of both the raw materials used and the different phases formed in their production processes. [ABSTRACT FROM AUTHOR]