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"WardsSci000450"
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Ward's Science Essentials® Obsidian
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Obsidian is hard black colored, volcanic glass.
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Ward's® Science Essentials® Pegmatite
Pegmatite is igneous rock similar to granite but with larger crystals.
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Ward's Science Essentials® Scoria
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Scoria is a dark-colored rock formed from lava with a high gas content.
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