Volcanic Glass
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the close-packed, highly ordered array of a crystal and the highly disordered array of gas. Volcanic glass can refer to the interstitial, or matrix material in an aphanitic (fine grained) volcanic rock or can refer to any of several types of vitreous igneous rocks. Most commonly, it refers to Obsidian, a rhyolitic gla...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the close-packed, highly ordered array of a crystal and the highly disordered array of gas. Volcanic glass can refer to the interstitial, or matrix material in an aphanitic (fine grained) volcanic rock or can refer to any of several types of vitreous igneous rocks. Most commonly, it refers to Obsidian, a rhyolitic glass with high silica content. Other types of volcanic glass include: Pumice, which is considered a glass because it has no crystal structure.
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