The Collaborative International Dictionary
Trachyte \Tra"chyte\, n. [Gr. ? 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.
Wiktionary
n. (context geology English) A pale igneous rock consisting mostly of potassium feldspar and plagioclase.
Wikipedia
Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF diagram). Biotite, clinopyroxene and olivine are common accessory minerals.
Trachyte is a volcanic rock.
Trachyte may also refer to:
- Trachyte Creek, a stream in Utah
- Trachyte Hill, a hill in Antarctica
- Trachyte Hills, a mountain range in British Columbia, Canada
- Trachytes, a genus of moths
Usage examples of "trachyte".
Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
The mountain chain is built up of granite, gneissoid, and schistose rocks, often in vertical position, and capped with trachyte and porphyry.
The characteristic rock is a black vitreous trachyte resembling pitchstone, but anhydrous.
Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark porphyroid trachyte.
The bedded volcanic rocks which form a series of ridges trending north-west comprise porphyritic basalts, andesite, and, near Port Luchdach, brownish trachyte.
On the plain of Inaquito and in the valley of Esmeraldas are vast erratic blocks of trachyte, some containing twenty-five cubic yards, having sharp angles, and in some cases a polished, unstriated surface.
Esmeraldas are vast erratic blocks of trachyte, some containing twenty-five cubic yards, having sharp angles, and in some cases a polished, unstriated surface.
The Ecuadorian volcanoes have rarely ejected liquid lava, but chiefly water, mud, ashes, and fragments of trachyte and porphyry.
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.