Naming Igneous Rocks

By: Ian Manlapaz

Contents

What are Igneous Rocks? The relative amounts of just three main

minerals Textures To name the rock References

What are Igneous Rocks?

It is rock formed by the solidification of molten magma.

The relative amounts of just three main minerals

Quartz plagioclase feldspar potassium feldspar mafic minerals

Terms from The relative amounts of just three main minerals

Feldspar-Any of a group of abundant rock-forming minerals occurring principally in igneous, plutonic, and some metamorphic rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely, barium.

Terms from The relative amounts of just three main minerals

Mafic-A term used to describe minerals or igneous rocks that are rich in iron and/or magnesium.

Terms from The relative amounts of just three main minerals

Felsic-A term used to describe light-colored igneous rocks with an abundance of light-colored minerals, especially felspars and quartz.

Textures

Intrusive- igneous rock that forms when magma is trapped deep inside the Earth.

Extrusive-igneous rock that is produced

when magma exits and cools outside of, or very near the Earth’s surface.

To name the rock…

1.)Compare the amounts of: Plagioclase feldspar Potassium feldspar quartz

To name the rock…

2.)Plot it on this chart….

References:

http://www2.nature.nps.gov/geology/usgsnps/rxmin/igclass.html

www.dictionary.com And:

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