Types of Obsidian Rocks

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Obsidian Igneous Rock

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The Many Variations of Obsidian Rock

The Many Variations of Obsidian Rock

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The Many Variations of Obsidian Rock

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Obsidian Igneous Rock

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The Many Variations of Obsidian Rock

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The Many Variations of Obsidian Rock

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Landscaping Rock: Obsidian Landscaping Rock

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Learning Geology: Obsidian