Alabama critical minerals site name 'Blue Circle quarry occurrence,' GSA internal feature identification number ALMIN.58.20.006, located in the Montevallo 7.5' quadrangle in Shelby County, Alabama. This site has been documented to contain the commodity(ies) aluminum (aluminum oxide), calcium (calcium oxide), calcium (calcium carbonate), iron (iron oxide), magnesium (magnesium oxide), manganese (manganese oxide), potassium (potassium pentoxide), silica (silicon dioxide). Was there past production of these minerals at this site?: Yes. The reference in which more information can be found on this site and its minerals can be found in: Puckett, T.M., Roberson, K.E., and Tew, B.H., 1990, High calcium deposits in the Newala Limestone (Appendix [...]