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tach·y·lytealso tach·y·lite (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.
[German Tachylyt : Greek takhu-, tachy- + Greek lutos, soluble (from lūein, to loosen; see leu- in Indo-European roots).]
tach′y·lyt′ic (-lĭt′ĭk) adj.
(Geological Science) a black basaltic glass often found on the edges of intrusions of basalt
[C19: from German Tachylit, from tachy- + Greek lutos soluble, melting, from luein to release; so called because it fuses easily when heated. The form tachylite is influenced by -lite stone]
tachylytic, ˌtachyˈlitic adj