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Igneous Rocks
Description:
Samples of Intrusive and Extrusive Igneous Rocks
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Grayish black trap rock.
Description:
Classic, very coarse-grained igneous texture.
Description:
Medium-grained with biotite.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Dark gray, with hornblende as the dominant mafic mineral.
Description:
Pegmatite is igneous rock similar to granite but with larger crystals.
Description:
Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.
Description:
Pyroxenite is ultramafic igneous rock made up of primarily pyroxene minerals.
Description:
Syenite a light-colored rock consisting of feldspars and hornblende.
Description:
Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
Description:
Pink feldspar mineral with a moh's hardness 6.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:
Coarse-grained plagioclase and pyroxene with some olivine.
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