- a granular igneous rock consisting chiefly of orthoclase and oligoclase with hornblende, biotite, or augite.
Origin of syenite
Examples from the Web for syenite
Historical Examples of syenite
The complete gradation from syenite to bauxite has been shown.The Economic Aspect of Geology
C. K. Leith
They sought no quarried blocks of syenite or granite for their work.
The Syenite granite was very hard, and capable of taking a high polish.
Of those standing, twenty-seven are made of Syenite granite.
Syenite, like granite, is recognised as an igneous as well as a metamorphic rock.Geology
- a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite
Word Origin for syenite
- A light-colored, coarse-grained igneous rock consisting primarily of alkali feldspar together with some mafic minerals, especially hornblende. Unlike most igneous rocks, syenite has little or no quartz. It is believed to form from the cooling of magma that forms at very high temperatures and at great depths. It is the coarse-grained equivalent of trachyte.