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Igneous Rock Specimens
Description:
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
Description:
Glassy; most specimens float in water.
Description:
Dark gray with abundant gas pocket vesicles.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:
Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
Description:
Obsidian is hard black colored, volcanic glass.
Description:
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
Description:
Coarse, “salt and pepper”: dark pyroxene and light andesine.
Description:
Dark gray, composed mostly of pyroxene and olivine.
Description:
Light gray, with flow structure.
Catalog Number:
(470026-142)
Description:
Banded volcanic glass.
Catalog Number:
(470346-970)
Description:
Volcanic glass with snowflakes embedded throughout.
Description:
Pale pink felsite, with small sanidine phenocrysts.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Coarse-grained plagioclase and pyroxene with some olivine.
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