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Webster 1913 Edition


Trachyte

Tra′chyte

,
Noun.
[Gr. [GREEK] rough, rugged: cg. F.
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.

Webster 1828 Edition


Trachyte

TRA'CHYTE

,
Noun.
[Gr.rough.] A species of volcanic rock, composed of crystals of glassy feldspar, sometimes with crystals of hornblend, mica, iron pyrite, &c.

Definition 2024


trachyte

trachyte

English

Noun

trachyte (plural trachytes)

  1. (geology) A pale igneous rock consisting mostly of potassium feldspar and plagioclase.
    • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 52:
      The type of rock that results is often described as trachyte and contains abundant crystals of a different kind of alkali-rich feldspar, such as sanidine, rather than plagioclase.

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