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Shale Rock
Shale rock is one of
the most
common sedimentary rocks.
It is the most common of all clastic sedimentary rocks.
It has silt and clay sized grains.
It consists mostly of clay minerals, but also others such as quartz, calcite and feldspar, and sometimes pyrite, iron and/or iron oxides.
By Travis via Flickr.com
It has a perfect layering and its splits very easily between the layers.
By Travis via Flickr.com
It can be found in layers interbedded with limestone or sandstone, or it can occur in huge sheets by itself.
By Ty via Flickr.com
It is formed on ocean bottoms, river floodplains or in the bottoms of shallow seas.
By jclor via Flickr.com
It can contain fossils of marine animals and plants.
By Dan Mullen via Flickr.com
Thanks to its layering, it is widely used in making pottery, bricks and tiles.
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