Obsidian is a rock composed of acidic volcanic glass. It occasionally contains small quantities of phenocrysts and crystallites. It is usually black and has a dense texture, a vitreous lustre and conchoidal fractures. Obsidian has a minimal water content; i.e. the H2O+ content is less than 2%. Its appearance is just like a piece of shiny coal.
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(2020). Obsidian. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_1767
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