Piece of black, volcanic glass.

一块黑色的火山玻璃。

Volcanic rock includes the volcanic glass obsidian.

火山岩包括黑曜岩火山玻璃。

But in 2008, an analysis of a handful of lunar volcanic glass beads suggested they might have formed in a watery environment.

但是，在2008年，对少量月球火山玻璃碎屑的分析显示它们可能是在含水的环境中形成的。

Smectite mainly came from the alteration of volcanic ash or volcanic glass and the weathering materials derived from land rocks.

蒙脱石除源于大陆派生的岩石风化物外，主要来自火山物质的蚀变。

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。