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tachylite
tach·y·lite [ tákə lt ] or tach·y·lyte [ tákə lt ]


noun 
Definition:
 
volcanic glass: black volcanic glass formed by the chilling of basaltic magma
[Mid-19th century. < German Tachylyt< Greek takhu- "quickly," from its rapid decomposition in acids, + lutos "soluble"]

tach·y·lit·ic [ tàkə líttik ] adjective
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