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Ward's Science Essentials® Obsidian
Clearance
Obsidian is hard black colored, volcanic glass.
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Ward's Science Essentials® Granite
Clearance
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
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Ward's Science Essentials® Pumice
Clearance
Pumice is light colored glassy rock that floats in water.
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Ward's Science Essentials® Gabbro
Clearance
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
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