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sandstone - white to cream fine-grained Springdale Sandstone Member of the Moenave Formation, a unique silver ore - teaching hand/display specimen

$ 7.50

The Springdale Sandstone is a geological oddity. In the Silver Reef Mining District in Washington County, Utah, this sandstone contained silver chloride. Silver Reef was the only major productive district of sandstone silver ores in the US and is one of the few places worldwide where sandstone contains silver.

Silver chloride or chlorargyrite is inconspicuous and almost invisible in the sandstone. At Silver Reef, it constitutes the silver end-member of the oxidized carnotite deposits of the Colorado Plateau, where the carnotite is contained in Lower Cretaceous and Upper Jurassic sandstones. It was deposited in braided stream channels and minor flood-plain environments, and contains poorly preserved carbonized plant fragments. Copper mineralization introduced specks of azurite and malachite.

The Early Jurassic Springdale Sandstone is a member of the Moenave Formation, though some geologists place it in the overlying Kayenta Formation, also Early Jurassic.

The field photo shows the Silver Reef Mining District, with Springdale Sandstone exposed on the hill in the background and more in the foreground mine workings.

We also have this sandstone in hand specimens that ship in a small flat rate Priority Mail box. These make sense if you are purchasing a single specimen.




Shipping: This ships in a Regional Priority Mail box and can share that box with other purchases.  

Select a specimen: If there is more than one specimen shown, you can select a specimen by telling us what is in front of it - a black mechanical pencil, a silver and black pen, a silver and blue pen, or one of those plus some number of coins, or you can let us make the selection.

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.