Questions and phone orders: 10 AM - 10 PM Pacific (760) 920-6465

sandstone - teaching hand specimen of Jurassic fine-grained white Navajo Sandstone, naturally bleached by reducing fluids

$ 7.50

The Navajo sandstone ranges from pinkish orange to white. The pinkish color is due to an iron oxide coating on the sand grains. In some areas reducing fluids flowed through the formation, removing the quartz grains' iron oxide coating to produce a white sandstone.

The Navajo was deposited during the Jurassic in an immense coastal and inland dune field, so the sand grains are frosted - they essentially sand blasted each other as they were moved by the wind. The frosted nature of the grains is characteristic of the Navajo and is easily visible under 20x magnification, though a student with sharp eyes can see this with 10x. 

The Navajo Sandstone makes up the cross-bedded cliffs at Zion National Park in Utah. Locally it is poorly to moderately well cemented with silica cement. These specimens are moderately cemented and will stand up to student examination, though grains of sand can be rubbed off. Near Hurricane, Utah the Navajo sandstone is 2,400 feet thick. 

These sand grains were carried west from the Appalachians by a Mississippi-scale river system and deposited at the continental edge, in present day Utah.  Deposited on beaches by the waves, the sand grains were picked up by the wind and deposited in a gigantic dune field similar to Egypt's Great Sand Sea.

The sand grains in these specimens are larger than those of a silt and will feel like fine sand to a student. It would be instructive to compare this sandstone with one is larger grained, with one that is cemented with calcium carbonate, and with different colored sandstones, as sandstone has great variety and a student should not see only one example.



Shipping: By Priority Mail or USPS Ground Advantage, whichever is cheaper, unless we find a better rate. Click >here< for shipping rates. Use back button to return to this page.

Select a specimen: When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with it, a black and silver pen, a black mechanical pencil, a blue and silver 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.