In a collection of geodes in the museum of St. Louis University, donated by V. Sosnovec in 1905, is one labeled “Flint Geode with Kaolin Endomorph, St. Louis County, Missouri.” The writer has been aware for some time that the kaolin mineral in this geode is dickite, but postponed publishing a description of the occurrence until more exact information was available regarding the locality. Since the excellent paper by Tarr and Keller1 on “Dickite in Missouri” has appeared it seems esirable to record this additional occurrence of dickite in Missouri even though the section of St. Louis county and the geologic formation furnishing the specimen are unknown. With the accepted hydrothermal origin of dickite, evidence is thus afforded that hydrothermal solutions reached east central Missouri during post-Mississippian time.

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