Four Mile Quarry, Porter, Grays Harbor Co., Washington, USA

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Small quarry in Eocence basalt of Crescent Formation in the Black Hills. Used to provide logging road material.

Ref:
Micro Probe Vol. 7 No. 5 Spring '92

Mineral List:

Analcime
Calcite
'Chabazite'
Cowlesite

'Heulandite'
'Lévyne'
Offretite
'Phillipsite'

Pyrite
Thomsonite-Ca

10 entries listed. 6 valid minerals.

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