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Igneous Rocks


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Description:   Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
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Description:   Pink feldspar mineral with a moh's hardness 6.
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Description:   Shiny black volcanic glass showing conchoidal fracture and some spherulites.
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Description:   Coarse-grained plagioclase and pyroxene with some olivine.
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Description:   Coarse, “salt and pepper”: dark pyroxene and light andesine.
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Description:   Dark gray, composed mostly of pyroxene and olivine.
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Catalog Number: (470226-462)

Description:   Introduce your students to rocks formed from the cooling of magma and lava.
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Description:   Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
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Description:   Light gray, with flow structure.
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Description:   Dark gray, with hornblende as the dominant mafic mineral.
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Description:   Dark gray with abundant gas pocket vesicles.
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Description:   Fine to medium-grained with biotite.
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Description:   Classic, dark; from the Columbia Plateau.
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Description:   Glassy; most specimens float in water.
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Description:   Gray-to-brown basaltic, with over 50% vesicles.
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Description:   Pegmatite is igneous rock similar to granite but with larger crystals.
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