The occurrence of a limestone in the Cheltenham fireclay of the St. Louis district is sufficiently unusual to merit a brief description. A spher-ulitic limestone in that situation should add to the interest, as adequate descriptions of spherulitic limestones are rare. This spherulitic limestone has two additional claims to distinction; it contains a sequence of five minerals including sphalerite, and the carbonate has been mistaken for diaspore and gibbsite.

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