02
Jun
Explain Why Syenite Is Classified As A Plutonic Igneous Rock. The dominant mineral is alkali feldspar usually orthoclase. Syenite is named for the city of Syene Egypt where many ancient monuments are made of this igneous rock. The slow cooling process allows crystals to grow large giving the intrusive igneous rock a coarse-grained or phaneritic texture. Plutonic igneous rocks intrusives those that cool slowly deep within the earth are coarse-grained and are classified on the basis of minerals identifiable with the unaided eye or with low 10X magnification.
Syenite is an igneous rock that solidified slowly in the crust in a similar manner to granite. If magma cools slowly deep within the crust the resulting rock is called intrusive or plutonic. Like actual granite both syenite and anorthosite have large interlocking crystals. They are formed when magma molten rock typically derived from the earths mantle solidifies. Silica-undersaturated igneous rocks typically are formed by low degrees of partial melting in the Earths mantle. Syenite is named for the city of Syene Egypt where many ancient monuments are made of this igneous rock.
Silica-undersaturated igneous rocks typically are formed by low degrees of partial melting in the Earths mantle.
This is because plutonic rocks are rocks formed when magma cools and solidifies. Syenite is named for the city of Syene Egypt where many ancient monuments are made of this igneous rock. Carbon dioxide may dominate over water in source regions. The black colors are likely two or three different minerals. This differentiation between magma and lava is important when we consider the two classifications of igneous rock. An extrusive rock of the same composition as syenite is called trachyte.