natural glass

1. 1.

   magma of any composition that cooled very rapidly

   Broaderglass

   Narrowerquartz glasstektite

Questions about natural glass

What does natural glass mean?

natural glass means "magma of any composition that cooled very rapidly".

Is natural glass a common word?

natural glass is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.