| NOUN | substance | natural glass | magma of any composition that cooled very rapidly |
|---|
| Meaning | magma of any composition that cooled very rapidly. | |
|---|---|---|
| Narrower | quartz glass, quartz, vitreous silica, lechatelierite, crystal | colorless glass made of almost pure silica |
| tektite | Thought to derive from meteorites | |
| Broader | glass | A brittle / brittle transparent solid with irregular atomic structure |
| Spanish | cristal natural | |
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