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WardsSci000450
Description:
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:
Glassy; most specimens float in water.
Description:
Dark gray with abundant gas pocket vesicles.
Description:
Fine to medium-grained with biotite.
Description:
Classic, dark; from the Columbia Plateau.
Description:
Pegmatite is igneous rock similar to granite but with larger crystals.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
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:
Introduce your students to Gray Andesite with large phenocrysts of hornblende.
Description:
Light gray, with flow structure.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Grayish black trap rock.
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