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1.a kind of natural glass produced when molten lava cools very rapidly.
一种天然玻璃，由熔化的火山岩快速冷却形成。收藏指正
2.A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
黑曜岩火山玻璃，一般为黑色，带状，摔碎时色泽光亮，表面变曲，由火山熔岩迅速凝而成收藏指正
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