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Volcanic breccia

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Volcanic breccia - A brecciated rock formed by the interaction of lava and scoria, or by the mixture of cooled lava and flowing lava. It takes the form of centimetre-scale angular clasts of often vesicular lava in a more compact matrix. It commonly forms at the top of a lava flow, and is then known as flowtop breccia. It is especially common between basaltic lava flows.

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