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Igneous Rocks


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Description:   Pegmatite is igneous rock similar to granite but with larger crystals.
Description:   Pyroxenite is ultramafic igneous rock made up of primarily pyroxene minerals.
Description:   Syenite a light-colored rock consisting of feldspars and hornblende.
Description:   Classic, dark; from the Columbia Plateau.
Description:   Abundant small black phenocrysts in a gray to brown matrix.
Catalog Number: (470026-142)

Description:   Banded volcanic glass.
Description:   Pink feldspar mineral with a moh's hardness 6.
Description:   Pale pink felsite, with small sanidine phenocrysts.
Description:   Dark gray with abundant gas pocket vesicles.
Description:   Obsidian is hard black colored, volcanic glass.

Description:   Volcanic glass with snowflakes embedded throughout.
Description:   Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
Description:   Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:   Coarse-grained plagioclase and pyroxene with some olivine.
Catalog Number: (470025-348)

Description:   Study the Formation of Different Igneous Rocks
Description:   Fine to medium-grained with biotite.
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