1. Naming Igneous Rocks By: Ian Manlapaz

2. Contents What are Igneous Rocks? The relative amounts of just three main minerals Textures To name the rock References

3. What are Igneous Rocks? It is rock formed by the solidification of molten magma.

5. The relative amounts of just three main minerals Quartz plagioclase feldspar potassium feldspar mafic minerals mafic

6. 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.

7. 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.

8. 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.

10. 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.

12. To name the rock… 1.)Compare the amounts of: Plagioclase feldspar Potassium feldspar quartz

13. To name the rock… 2.)Plot it on this chart….

15. References: http://www2.nature.nps.gov/geology/usgsnps /rxmin/igclass.html http://www2.nature.nps.gov/geology/usgsnps /rxmin/igclass.html www.dictionary.com And:

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