Igneous Rocks
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Description:
Pyroxenite is ultramafic igneous rock made up of primarily pyroxene minerals.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Introduce your students to Gray Andesite with large phenocrysts of hornblende.
Description:
Light gray, with flow structure.
Description:
Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Glassy; most specimens float in water.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
Description:
Fine to medium-grained with biotite.
Description:
Dark gray with abundant gas pocket vesicles.
Description:
Medium-grained with biotite.
Description:
Classic, dark; from the Columbia Plateau.
Catalog Number:
(470026-142)
Description:
Banded volcanic glass.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Coarse-grained plagioclase and pyroxene with some olivine.
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