Tachylyte meaning

tăk'ə-līt'
A brown, black, or green volcanic glass formed from basaltic magma and often found along the edges of dikes, sills or volcanic flows, where rock usually forms first by contact with the cooler surrounding rock.
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A kind of dark-colored, basaltic volcanic glass.
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(geology) A black, vitreous basalt of volcanic origin.
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Origin of tachylyte

German Tachylyt Greek takhu- tachy- Greek lutos soluble (from lūein to loosen leu- in Indo-European roots)