Sedimentary

Sedimentary rocks are composed from other rocks and minerals cemented together. Like igneous and metamorphic rocks, sedimentary rocks also have characteristics, that are called properties. Some properties of sedimentary rocks include: clastic, course-grained, fine-grained, stratified and well-bedded. A clastic sedimentary rock contains fragments of rocks and/or minerals ("clasts") that are cemented together in a matrix. A matrix is a universal property, it is the background material in which something is embedded. The next property is called course-grained. If a sedimentary rock is course-grained, than it has large particles or clasts that are visible to the naked eye. The opposite of this property is fine-grained, which means that a sedimentary rock has small particles that are combined together. This will usually make the rock feel gritty or sandy. Another property, stratified, means that your rock has obvious horizontal layers. The final property of sedimentary rocks is called well-bedded. Well-bedded rocks have a flat shape. This results from sediments compiling at the bottom of a body of water.

Flickr Image

This is conglomerate, a clastic and course-grained sedimentary rock.

Wikimedia Image

This is limestone, a fine-grained sedimentary rock.

Wikimedia Image

This sedimentary rock formation is a good example of the stratified property.

Flickr Image

This is shale, a well-bedded sedimentary rock.

***Tip: If a rock contains fossils, it is almost certain that it is sedimentary.***

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