If the volcanic glass obsidian is not considered a mineral, why is it considered a rock?

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Conceptual Physical Science

ISBN: 978-0134060491

6th edition

Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt

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Question Posted: Feb 12, 2019 07:50 AM

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If the volcanic glass obsidian is not considered a mineral, why is it considered a rock?

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Obsidian is not a mineral because it lacks a crystalline structure alt...View the full answer

Conceptual Physical Science

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