The mineral remingtonite, supposedly a hydrous cobalt—carbonate, was described by J. C. Booth in 1852 from the old mine at Finksburg, Carroll County, Maryland. The composition was based upon qualitative tests, the mineral being considered a carbonate because of a slight effervescence when it was treated with hydrochloric acid. It occurred associated with carrollite as a rose red, very thin coating on serpentine.

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