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Igneous Rocks
Description:
Glassy; most specimens float in water.
Description:
Gray-to-brown basaltic, with over 50% vesicles.
Description:
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
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:
Samples of Intrusive and Extrusive Igneous Rocks
Description:
Obsidian is hard black colored, volcanic glass.
Catalog Number:
(470346-970)
Description:
Volcanic glass with snowflakes embedded throughout.
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Classic, very coarse-grained igneous texture.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
Description:
Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
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