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Igneous Rocks
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.
Catalog Number:
(470346-970)
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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