| 1. | Volcanic ash is composed of fragments of rock, crystalline material, and volcanic glass.
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| 2. | Feldspar, amphiboles, pyroxenes, and volcanic glass are the principle donors of clay minerals.
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| 3. | Even now the volcanic glass can be found on the sides of the mountain.
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| 4. | Darker coloured ignimbrites may be densely welded volcanic glass or, less commonly, mafic in composition.
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| 5. | Furthermore, the area had feldspars and volcanic glass that would be valuable for chronometric dating.
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| 6. | Obsidians are natural volcanic glasses ( not crystals ) that form from rapidly cooled lava.
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| 7. | They fought with a wooden sword studded with obsidian volcanic glass blades, called a macuahuitl.
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| 8. | The difference in water content can be used to distinguish tektites from terrestrial volcanic glasses.
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| 9. | First, they are completely glassy and lack any microlites or phenocrysts, unlike terrestrial volcanic glasses.
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| 10. | The flow consists of obsidian, a dark volcanic glass.
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