sandstone - Navajo Sandstone - hand specimen of an aeolian sandstone for Sale

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sandstone - Navajo Sandstone - hand specimen of an aeolian sandstone For Sale

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sandstone - Navajo Sandstone - hand specimen of an aeolian sandstone:
$8.20

If making multiple purchases, please read the note following the red text below!Teaching hand specimen of a fine-grained pinkish-orange sandstone - Navajo sandstone
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. The sand grains are entirely frosted quartz dune sand.They are large enough thatwith a 10x hand lens,a student can see the frosted surface, a characteristic of this sandstone.
The Navajo was deposited during the Jurassic in a vast coastal and inland dune field. Near Hurricane, Utah this aeolian-origin sandstone is 2,400 feet thick. Swallows building their nests under an overhang at the cliff where these specimens were collected have the mud they use for their nests stained by the same hematite that coats the grains of this sandstone.
The sand grains in these specimens are larger than those of a silt and will feel sandy 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.

These specimens will fit into a 3.5” x 5.25\" specimen tray.We include data with every specimen: collecting locality for mineral specimens and for rocks also the formation and age, if determined.

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 mechanical pencil, a silver and black pen, or one of those plus some number of coins, or you can let us make the selection.

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