| Back | 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 |
|---|---|
| Front | hēi yào yán huǒshān bōli yībān wéi hēisè dài zhuàng shuāi suì shí sèzé guāngliàng biǎomiàn biàn qū yóu huǒshān róngyán xùnsù níng ér chéng A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava. |
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