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Igneous Rocks
Description:
Obsidian is hard black colored, volcanic glass.
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
Description:
Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
Description:
Classic, very coarse-grained igneous texture.
Description:
Pink feldspar mineral with a moh's hardness 6.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:
Dark gray, composed mostly of pyroxene and olivine.
Description:
Coarse-grained plagioclase and pyroxene with some olivine.
Description:
Coarse, “salt and pepper”: dark pyroxene and light andesine.
Description:
Dark gray, with hornblende as the dominant mafic mineral.
Description:
Light gray, with flow structure.
Catalog Number:
(470226-462)
Description:
Introduce your students to rocks formed from the cooling of magma and lava.
Description:
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
Description:
Classic, dark; from the Columbia Plateau.
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