Gypsum, Petroleum (Var: Bitumen)
Walworth Quarry, Walworth, Wayne County, New York, USA
10.0 x 8.5 x 5.2 cm. Well-formed gypsum specimens are very rare from this famous Silurian-aged, Lockport Dolomite, road metal quarry, renowned for fabulous, water-clear, aqua-blue fluorite cubes. The sculptural, transparent cleavage, attached to the dolomite also has an area of brown asphaltum included in the gypsum and coating the adjacent ...
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