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Topic 11:Rocks&Min.s

Igneous Rocks, pages (226-228).

QuestionAnswer
Define an Igneous Rock. Any rock formed from molten material.
Compare magma with lava. Magma is molten below the surface; lava is molten above the surface of the Earth.
Contrast an intrusive with an extrusive igneous rock (environment of formation). Intrusive cools slowly below ground which results in large crystals. Extrusive cools quickly above ground which results in small crystals.
How can we identify an igneous rock? By observing inter-grown crystals that result from the crystallization process.
Define Texture: The crystal formation in an igneous rock. Glassy means no crystal development. Fine means small crystals. Coarse suggests large crystals.
Describe a felsic igneous rock. An igneous rock that contains an abundance of Silicon and Aluminum.
Describe a mafic igneous rock. An igneous rock that contains an abundance of iron and magnesium.
Name two key minerals commonly found in a felsic igneous rock. Quartz and Potassium Feldspar. (see ESRT pg. 6)
List two key minerals commonly found in a mafic igneous rock. Olivine and Pyroxine. (see ESRT pg. 6)
Contrast the colors of felsic vs. magic igneous rocks. Felsic is light while mafic is dark in color.
Define vesicular: An igneous rock full of gas holes! Looks like a sponge or honey comb.
Describe granite! (see ESRT Pg. 6) Coarse texture, intrusive, light color, felsic, low density, containing quartz and potassium feldspar.
Created by: whearn
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