Robertson Quarry
Dayton
Lewis County
Washington

Analcime
Calcite
Chlorite
Natrolite
Pyrite

Sources:

Lasmanis, Raymond (1988)
Minerals of the Crescent Formation, Roberson Pit, Mason County, Washington
Rocks and Minerals, Vol. 63 No. 1 p. 24-28

Ream, Lanny R.(1991)
Washington Mineral Locality Index
Rocks and Minerals, Vol. 66 No. 4, p. 286-292

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