Jisho

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こくようせき 黒曜石
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Noun
1. obsidian​See also 黒曜岩
Wikipedia definition
2. Obsidian​Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.
Read “Obsidian” on English Wikipedia
Read “黒曜石” on Japanese Wikipedia
Read “Obsidian” on DBpedia
Other forms
黒耀石 【こくようせき】
Notes
黒耀石: Out-dated kanji or kanji usage.

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