Description: Gypsum Mariposa Mine, California Hill, Terlingua Mercury District, Brewster County, Texas, USA 3.5 X 4.5 cm. Gypsum "Ram's Horn". 3.5 X 4.5 cm. From a cavern (The "Crystal Cavern") between the 300 and 400 levels, Mariposa Mine, California Hill, Terlingua Mercury District, Brewster County, Texas.

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