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tachylyte

[tak-uh-lahyt] /ˈtæk əˌlaɪt/
noun, Petrography
1.
a black, glassy form of basalt, readily fusible and of a high luster.
Also, tachylite.
Origin
1865-1870
1865-70; tachy- + -lyte2
Related forms
tachylitic
[tak-uh-lit-ik] /ˌtæk əˈlɪt ɪk/ (Show IPA),
adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for tachylyte
  • Maybe they sought tachylyte, a dense form of basalt used for arrow points and stone tools.
British Dictionary definitions for tachylyte

tachylyte

/ˈtækɪˌlaɪt/
noun
1.
a black basaltic glass often found on the edges of intrusions of basalt
Derived Forms
tachylytic (ˌtækɪˈlɪtɪk), tachylitic, adjective
Word Origin
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for tachylyte

tachylite

glassy igneous rocks low in silica, such as basalt or diabase. Tachylytes are black with a pitchlike or resinous lustre; in thin sections they are characteristically brown and translucent, and the glass is crowded with granules of magnetite. Tachylytes are found only under conditions that imply rapid cooling, and they are much less common than are the corresponding acid volcanic glasses, principally because of the greater fluidity and greater tendency of basic lavas to crystallize.

Learn more about tachylite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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