Sandstone Rock


Sandstone rock is medium-grained clastic sedimentary rocks. 

It had larger grains than siltstone and mudstone but smaller than breccia and conglomerate.





Their grains are large and hard enough that they need to be cemented together.

The cement material is silica or calcium carbonate.

 sandstone rock

The grains themselves consist of varying amounts of quartz, micas and feldspars.

 sandstone wall
 By arbyreed via Flickr.com
 
The feldspar-rich variety is called arkose (Uluru - Ayers Rock is made of arkose); the quartz-rich variety is called orthoquartzite; and greywacke is rich in both.

 sandstone formation
 By Beau Rogers via Flickr.com

Sandstone is the second most common sedimentary rock after shale and it makes up for about 15% of the sedimentary rocks in the crust of the Earth.

 sandstone rocks 
 
By arbyreed via Flickr.com
 
It is an important rock for geologists because it is abundant and often well exposed.

 grand canyon pictures
 By Mark via Flickr.com

Its layers, beddings, ripple marks and fossils tell them not only about the conditions where the particular rock was formed, but also more general things about the history of geology.

 bruce canyon
 By Don Graham via Flickr.com

It is also a very spectacular rock - Grand Canyon and Bruce Canyon are only two examples.

 ayers rock australia 
 By Paul Arps via Flickr.com
 
And, it has been a very handy rock, used in buldings since ancient times.













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