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Acme Cement Plaster Company workings (Navajo Gypsum & Fertilizer), Winslow, Navajo Co., Arizona, USA

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Detailed Mineral List:
Gypsum
Formula: CaSO4 · 2H2O
Description: As a bed 4 inches to 4 feet thick, avg. 18 inches.
Reference: Galbraith, F.W. & Brennan (1959), Minerals of AZ: 60.
Gypsum var: Selenite
Description: Mined as large plates in upper member Permian Supai Formation.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 242; Peirce, H.W. & T.A. Gerrard (1966), Evaporite deposits of the Permian Holbrook Basin, AZ, 2nd. Symposium on Salt. Northern Ohio Geological Soc., Inc. 1: 1-10; Stone, R.W. (1920), Gypsum deposits of the US, USGS Bull. 697: 51; Galbraith, F.W. & Brennan (1959), Minerals of AZ: 60.


2 entries listed. 1 valid mineral.
Mineral and/or Locality  
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