Trachyte

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Trachyte (Geol) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica.
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Century Dictionary and Cyclopedia
    • n trachyte A volcanic rock exhibiting a characteristic roughness when handled. At present it is sought to limit the term to rocks composed essentially of sanidine, with more or less triclinic feldspar; hornblende, biotite, and magnetite are also frequently present in greater or less quantity. Much of the rock of the Cordilleras, formerly called trachyte, is now considered by lithologists to belong move properly among the andesites.
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Chambers's Twentieth Century Dictionary
    • n Trachyte trā′kīt a crystalline igneous rock, generally grayish in colour, usually fine-grained or compact, more or less markedly porphyritic, with large crystals of sanidine and scales of black mica
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Etymology

Webster's Revised Unabridged Dictionary
Gr. rough, rugged: cg. F. trachyte,
Chambers's Twentieth Century Dictionary
Gr. trachys, rough.

Usage

In literature:

Trachyte, separation of basalt and.
"More Letters of Charles Darwin Volume II" by Charles Darwin
The building material was trachytic rock as found upon the mesa.
"The Prehistoric World" by E. A. Allen
The whole range is for the most part composed of various kinds of trachytic conglomerate.
"Round About the Carpathians" by Andrew F. Crosse
The Ecuadorian volcanoes have rarely ejected liquid lava, but chiefly water, mud, ashes, and fragments of trachyte and porphyry.
"The Andes and the Amazon" by James Orton
We left Trachyte Creek and reached Prof. at two o'clock.
"A Canyon Voyage" by Frederick S. Dellenbaugh
The rocks named trachytes by M. Hauey merit the same attention.
"Movement of the International Literary Exchanges, between France and North America from January 1845 to May, 1846" by Various
Extensive beds of tuff and breccia accompany the trachytic masses.
"Volcanoes: Past and Present" by Edward Hull
Next to these was a clock frame made out of trachyte in the form of a Greek temple.
"Through South Africa" by Henry M. Stanley
Some of these are composed of trachyte, others of compact blue basalt with olivine.
"Principles of Geology" by Charles Lyell
Large areas are overlain with trachyte, basalt, obsidian, tuff and pumice.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5" by Various
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In poetry:

The trachyte wall, beseamed and battle scarred;
The porphyritic tower and citadel;
The granite ramparts and embattlements
Of nature's fort, impregnable and wild,
Stand as a symbol of eternal strength,
And hurl a challenge to the elements!
"Grandeur." by Alfred Castner King