Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.

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Presentation transcript:

Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf

Basalt Mafic Fine-grained Black May have bubble holes like Swiss cheese Volcanic

Obsidian Volcanic glass Smooth with sharp edges Forms by quick cooling Can be mafic or felsic Volcanic

Pumice Froth of volcanic glass Light weight commonly floats in water Rough surface Forms as foam when lava slops around Volcanic

Scoria Mafic Red color due to oxidation of iron in mafic lava Rough, commonly bubbly Volcanic

Rhyolite Felsic Fine-grained Pink/tan/white color May contain pumice fragments Volcanic

Andesite Tuff Intermediate Fine-grained with chunks of other rocks Green/gray Forms by explosive eruption Volcanic

Granite Felsic Coarse-grained can see crystals Pink/tan/white with dark specks Plutonic (forms deep within earth, not volcanic)

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