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Google Image Result for http://www.prehistoricplanet.com/images/features/earth/geologictime/geologictime1.jpg

Google Image Result for http://www.prehistoricplanet.com/images/features/earth/geologictime/geologictime1.jpg

Gneiss ( /ˈnaɪs/) is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks.

Gneiss ( /ˈnaɪs/) is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks.

Top 10 Signs You Might be a Geologist: #7 - Your rock garden is located inside your house.  Click here for more geology fun! http://minimegeology.com/

Top 10 Signs You Might be a Geologist: #7 - Your rock garden is located inside your house. Click here for more geology fun! http://minimegeology.com/

Oolitic Limestone Sedimentary Rock $4.00

Oolitic Limestone Sedimentary Rock $4.00

Shale is a clastic sedimentary rock that is made up of clay-size (less then 1/256 millimeter in diameter) weathering debris. It typically breaks into thin flat pieces. The specimen shown above is about two inches (five centimeters) across.

Shale is a clastic sedimentary rock that is made up of clay-size (less then 1/256 millimeter in diameter) weathering debris. It typically breaks into thin flat pieces. The specimen shown above is about two inches (five centimeters) across.

Pumice is a light-colored vesicular igneous rock. It forms through very rapid solidification of a melt. The vesicular texture is a result of gas trapped in the melt at the time of solidification. The specimen shown above is about two inches (five centimeters) across.

Pumice is a light-colored vesicular igneous rock. It forms through very rapid solidification of a melt. The vesicular texture is a result of gas trapped in the melt at the time of solidification. The specimen shown above is about two inches (five centimeters) across.

Types of peridotite - Peridotite is a generic name for a number of different rock types. All of them are rich in olivine and mafic minerals. They are usually green in color and have a high specific gravity for a nonmetallic material. Shown above are specimens of lherzolite, harzburgite, dunite, and wehrlite. Image by USGS.

Types of peridotite - Peridotite is a generic name for a number of different rock types. All of them are rich in olivine and mafic minerals. They are usually green in color and have a high specific gravity for a nonmetallic material. Shown above are specimens of lherzolite, harzburgite, dunite, and wehrlite. Image by USGS.

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