trachyte

Light-coloured, very fine-grained igneous rock composed chiefly of alkali feldspar with only minor mafic minerals (biotite, hornblende, or pyroxene). Trachyte is commonly found in volcanic regions; like many volcanic rocks, it shows a streaked or banded structure due to flowing of the congealing lava.

trachyte [′tra‚kīt]

(petrology)

The light-colored, aphanitic rock (the volcanic equivalent of syenite), composed largely of alkali feldspar with minor amounts of mafic minerals.

Trachyte

a cenotypal extrusive, usually porphyritic rock. Porphyritic phenocrysts and microlites embedded in volcanic glass are represented by sanidine; neutral and acid plagioclase, biotite, pyroxene, or amphibole are encountered in lesser amounts. Trachyte is the extrusive equivalent of syenite. It consists of up to 60 percent silica and up to 10 percent alkalies. The rock is rough to the touch. There are glassy trachytes, such as obsidians and pumices, and trachytic tuffs. Trachytes grade into liparites, andesites, and basalts. They are found in the Caucasus and, outside the USSR, in Italy and France. Trachyte is a relatively rare rock. (See also.)

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No references found	To the conglomerate and trachyte succeeded black basalt, the first dispread in layers full of bubbles, the latter forming regular prisms, placed like a colonnade supporting the spring of the immense vault, an admirable specimen of natural architecture. 20,000 Leagues Under The Sea by Verne, Jules View in context	Tracer Mixture Traceroute tracery Trachea tracheary Tracheata Tracheid Tracheitis trachelium Tracheophyta tracheophyte Tracheotomy Trachinus Trachoma trachomatous conjunctivitis Trachomedusae Trachonitis Trachurus trachybasalt Trachycarpus Trachylida Trachylina Trachymedusae Trachypsammiacea Trachystomata Trachyte Trachytic Texture trachytoid texture tracing cloth tracing distortion tracing paper tracing routine Track track adaptation effect Track and Field Athletics track angle track ball track cable track cable scraper track chart Track Circuit track crawling track density track event track gage track haulage track homing track hopper track in range Track Indicator Track Jack	Trachonitis Trachonychia Trachtenberg Family Slideshow Players Trachtenberg School of Public Policy and Public Administration Trachurus Trachurus Trachurus symmetricus Trachurus trachurus Trachyandesite Trachyandra trachybasalt Trachycarpous Trachycarpus Trachylida Trachylina Trachylina Trachymedusae Trachymedusae Trachymene Trachyonychia trachyphonia trachyphonia trachyphonia Trachypremnon Trachypsammiacea Trachypteridae Trachyspermous Trachyspermum ammi Trachystomata Trachystomata Trachyte trachytes trachytes trachytic trachytic Trachytic Texture Trachytoid trachytoid texture Traci Traci Traci tracing tracing tracing tracing tracing tracing back Tracing Change Notice Tracing cloth Tracing cloth tracing distortion Tracing Management Technology tracing paper tracing paper tracing routine tracing routine tracings tracings tracings tracings, pantographic TRACIR

To the conglomerate and trachyte succeeded black basalt, the first dispread in layers full of bubbles, the latter forming regular prisms, placed like a colonnade supporting the spring of the immense vault, an admirable specimen of natural architecture.

20,000 Leagues Under The Sea by Verne, Jules View in context

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trachyte

Trachyte