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Deutsche Trachytporphyr {m}; Trachyt {m} [geol.] Synonyme

geol  

Englische trachyte Synonyme

trachyte Definition

Trachyte
(n.) 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.

trachyte Bedeutung

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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. . Biotite, clinopyroxene and olivine are common accessory minerals.