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pseudotachylite
pseudotachylite n.
Brit. 
/ˌs(j)uːdə(ʊ)ˈtakɪlʌɪt/
, /ˌs(j)uːdə(ʊ)ˈtakɪlʌɪt/U.S. /ˌsudoʊˈtækᵻˌlaɪt/
(also pseudotachylyte) Geology a dark, fine-grained or glassy intrusive rock resembling tachylite that results from vitrification by frictional heat generated during dynamic metamorphism and typically occurs in faults and veins./ˌsudoʊˈtækᵻˌlaɪt/ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > trap > basalt > other basaltic
bluestone1849
palagonite1851
tholeiite1866
tachylite1868
anamesite1876
dhu stone1879
hyalomelan1879
tephrite1879
shoshonite1895
pseudotachylite1917
ankaramite1926
oceanite1926
1917 S. J. Shand in Q. Jrnl. Geol. Soc. 72 199 The name pseudotachylyte has been adopted in recognition of the fact that these rocks have a great similarity to tachylyte.
1954 H. Williams et al. Petrogr. xi. 202 X-ray investigation and measurement of the refractive index have shown some pseudotachylytes to be cryptocrystalline products of extreme crushing of rocks such as granite, without actual melting.
2005 Nature 30 June 1171/1 The Bergen Arc eclogites exhibit features..such as the brittle fracturing of the garnets they contain, and the formation of pseudotachylites (rocks formed by friction melting along fractures) within them.
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