Definition of volcanic glass
: natural glass produced by the cooling of molten lava too rapidly to permit crystallization
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But in 2008, a study published in the journal Nature, revealed that samples of volcanic glass brought back in the 1970s during the Apollo 15 and 17 missions contained trace amounts of the stuff.
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First Known Use of volcanic glass
1780
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See words that rhyme with volcanic glass Britannica.com: Encyclopedia article about volcanic glass
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