graywacke -  teaching student specimens of a tan dirty sandstone -  Unit of 5 specimens

graywacke - teaching student specimens of a tan dirty sandstone - Unit of 5 specimens

Brand: Geological Specimen Supply
4.20 USD In stock Buy at Merchant

Graywacke is a type of sandstone with mixed fragments of rock, quartz, and minerals in a clay matrix, formed in deep water during the Upper Cretaceous period.

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  • Default Title — 4.20 USD — In stock

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