Rock Classification a world of rocks


Sedimentary Rocks are formed with particles of other rock. There are 3 different types of Sedimentary Rocks. These include: Clastic, Chemical, and Organic. Each of these rocks have their own characteristics and are found in numerous places all over the globe. In addition, these rocks actually cover more than 70% of our planet. Although they may not be fun to look at, they certainly play a large role in Earth's history.


The rock above is known as a clastic rock. Clastic rocks are formed by a process known as mechanical weathering. This involves the formation of sediments through the weather and our planets' environment.


Secondly, we have Chemical Sedimentary Rocks. These rocks are formed by precipitation of solution. They are more textured then clastic rocks and are often heavier and/or more dark in color.


Lastly, we have rocks known as Organic Sediments. These are formed from plant debris and animal debris. They can appear to be more unique in texture and in color. The density is also varied depending on type.

Lots of Sedimentary Rocks can be found in our own country! The Grand Canyon region is filled with sediments of all colors, shapes, widths, lengths, and types. The canyon itself is one large sedimentary rock. All of the layering in the canyon provides scientists with solid proof that these processes really do exist and take millions of years.


Metamorphic rocks are rock fragments that have been affected by heat pressure, and chemical processes. They are usually found deep under the Earth's surface. There are two types of main metamorphic rocks, they are known as foliated and non-foliated. The chemical composition of these rocks can vary and they have interesting wavy-like textures.

Large Metamorphic Rock on the Water


These types of rocks have a layered and striped kind of look. Their textures can be hard, soft, and even broken or burned looking. These textures and looks are caused by heat and pressure the rock has to withstand in its origin.

Foliated Properties

Non-foliated Metamorphic Rocks

These rocks do not have a very layered or banded texture and look. They are smoother and have no hole or any air pressure. The reason for these textures and looks is the lack of heat and pressure in these rocks' environments.

Metamorphic rocks are found all over the world. They are very common to appear on hills and roads. Also, cliffs and rocks can commonly hold these natural treasures.


These types of rocks include intrusive and extrusive properties. They form from magma and lava and are mostly established from volcanic properties. These rocks are known to cool slowly and have crystals. Also, the air-pockets/holes are a clear sign of their igneous origin.

These rocks are found mostly all over the globe. More commonly, they are formed in volcanoes or in volcanic craters. They can also be formed from geysers and other forms of volcanic activity.


These are used to see a rock very up close. You can then determine what type of rock you are observing.
These are commonly used to find out the true composition of a rock due to its high amounts of zoom.
Created By


Created with images by bluesbby - "The big rock" • James St. John - "Black shale" • James St. John - "Anthracite coal (Mammoth Coal, Llewelyn Formation, Middle Pennsylvanian; Pioneer Tunnel Coal Mine, Ashland, Pennsylvania, USA)" • James St. John - "Lignite coal (Tertiary; western USA)" • D Guisinger - "Grand Canyon - Parashant Natl Monument Map" • Kristi Herbert - "Metamorphic rock, North Lewis" • James St. John - "Greenstone (metagabbro) (metamorphism at ~2.7 Ga, Neoarchean; Rt. 169 roadcut south of Peyla, Minnesota, USA) 5" • James St. John - "Pleistocene glacial erratic composed of Precambrian gneiss (Mt. Pleasant, Lancaster, Ohio, USA) 1" • James St. John - "Black slate with original shale bedding" • James St. John - "Quartzite (Sioux Quartzite, Paleoproterozoic, 1.65 to 1.70 Ga; city of Sioux Falls, Transcontinental Arch, southeastern South Dakota, USA)" • James St. John - "Quartzite 2" • James St. John - "Quartzite 3" • Michael 1952 - "Map Of Ireland" • Steve Snodgrass - "Curvy Rock (Sedimentary)" • James St. John - "Snowflake obsidian" • James St. John - "Zinciferous marble (Franklin Marble, Mesoproterozoic, 1.03-1.08 Ga; zinc mine in Franklin, northern New Jersey, USA) 1" • Pexels - "dawn daylight fence" • Michael David Pedersen - "Magnifying glass" • John-Morgan - "Microscope"

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