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Volcanic glass   /vɑlkˈænɪk glæs/   Listen
Volcanic glass

noun
1.
A kind of natural glass produced when molten lava cools very rapidly.





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"Volcanic glass" Quotes from Famous Books



... and Pearlstone are only different forms of a volcanic glass produced by the fusion of trachytic rocks. The distinction between them is caused by different rates of cooling from the melted state, as has been proved by experiment. Obsidian is of a black or ash-grey colour, and though opaque in mass is ...
— The Student's Elements of Geology • Sir Charles Lyell


Words linked to "Volcanic glass" :   pitchstone, volcanic rock, obsidian, tachylite


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