| volcanic glass n. Natural glass produced by the cooling of molten lava too quickly to permit crystallization. |
volcanic glass
n
(Earth Sciences / Geological Science) any of several glassy volcanic igneous rocks, such as obsidian and pitchstone
| volcanic glass Natural glass produced by the cooling of molten lava too quickly to permit crystallization. Obsidian is a type of volcanic glass. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  volcanic glass - a kind of natural glass produced when molten lava cools very rapidlyobsidian - acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces pitchstone - dark acid granitic glass tachylite - a basic or basalt glass volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth |
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