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Igneous Rocks


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Description:   Diorite is a mix of dark pyroxene and light andesine provides perfect representation of an intermediate igneous rock.
Description:   Classic, dark; from the Columbia Plateau.
Description:   Pale pink felsite, with small sanidine phenocrysts.
Description:   Abundant small black phenocrysts in a gray to brown matrix.
Description:   Medium-grained with biotite.
Description:   Samples of Intrusive and Extrusive Igneous Rocks
Catalog Number: (470026-142)

Description:   Banded volcanic glass.
Description:   Dark gray with abundant gas pocket vesicles.
Description:   Obsidian is hard black colored, volcanic glass.
Description:   Gray, medium to coarse-grained alkali feldspar.
Description:   Syenite a light-colored rock consisting of feldspars and hornblende.
Description:   Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:   Classic texture in graphic granite.
Description:   Pyroxenite is ultramafic igneous rock made up of primarily pyroxene minerals.
Description:   Pegmatite is igneous rock similar to granite but with larger crystals.
Description:   Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.
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