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Igneous Rock Specimens
Description:
Light gray, with flow structure.
Description:
Coarse, “salt and pepper”: dark pyroxene and light andesine.
Description:
Pale pink felsite, with small sanidine phenocrysts.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Grayish black trap rock.
Description:
Glassy; most specimens float in water.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Pegmatite is igneous rock similar to granite but with larger crystals.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
Description:
Introduce your students to Gray Andesite with large phenocrysts of hornblende.
Description:
Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.
Description:
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
Description:
Scoria is a dark-colored rock formed from lava with a high gas content.
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