Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Obsidian

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1767

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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