Portaway Pit (Portway Pit; Gravel pit; Old Wham vein), Castleton, Derbyshire, England, UK
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List of minerals for each chemical element
Ford, T.D., Sarjeant, W.A.S., and Smith, M.E. (1993): The minerals of the Peak district of Derbyshire. UK Journal of Mines and Minerals 13, 16-55.