Noun
a kind of natural glass produced when molten lava cools very rapidly
Source: WordNetNote white plagioclase "microlites" in cross-polarized light picture, surrounded by very fine grained volcanic glass. Source: Internet
Lava continues to flow from five fissures of the volcano, and the impact of vog (volcanic gas) as well as Pele’s hair (volcanic glass) are still felt on the island. Source: Internet
Made out of hydrochloric acid, steam, and shards of volcanic glass, the gas is hazardous to anyone who breathes it. Source: Internet
Even now the volcanic glass can be found on the sides of the mountain. Source: Internet