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Igneous Rocks
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
Description:
Coarse-grained plagioclase and pyroxene with some olivine.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Classic, dark; from the Columbia Plateau.
Description:
Obsidian is hard black colored, volcanic glass.
Catalog Number:
(470106-756)
Description:
<i>Includes</i>: six each of obsidian, pumice, and basalt. Set of 18.<BR><BR>Common rocks and minerals for testing and identification studies are 2–3cm each.
Catalog Number:
(470026-142)
Description:
Banded volcanic glass.
Description:
Samples of Intrusive and Extrusive Igneous Rocks
Description:
Introduce your students to Gray Andesite with large phenocrysts of hornblende.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
Description:
Pegmatite is igneous rock similar to granite but with larger crystals.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Gray, fine, friable, with abundant small sanidine crystal fragments.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
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