Families of Igneous Rocks
Felsic- Light Colored and its magma contains a large proportion of silica and has mineral components of potassium, feldspar, and quartz, muscovite mica, and biotite mica. An example of a Felsic Igneous Rock is Granite.
Mafic- Dark Colored and its magma contains a lot of Iron, Magnesium, and low proportion of silica. Its mineral components are plagioclase feldspar, hornblende, pyroxene, and biotite mica. An example of a Mafic Igneous Rock is Gabbro.
Intermediate- Medium colored and its magma has a higher proportion of silica than Mafic but lower than Felsic. Its Mineral components are plagiocalse feldspar, hornblende, pyroxene, and biotite mica. An example of an Intermediate Igneous Rock is Diorite.
Mafic- Dark Colored and its magma contains a lot of Iron, Magnesium, and low proportion of silica. Its mineral components are plagioclase feldspar, hornblende, pyroxene, and biotite mica. An example of a Mafic Igneous Rock is Gabbro.
Intermediate- Medium colored and its magma has a higher proportion of silica than Mafic but lower than Felsic. Its Mineral components are plagiocalse feldspar, hornblende, pyroxene, and biotite mica. An example of an Intermediate Igneous Rock is Diorite.
Textures of Igneous Rocks
Course Grained- Igneous Rocks that have large grained minerals formed from well developed crystals. An example a Course Grained Igneous Rock is Granite.
Fine Grained- Igneous Rocks that contains small crystals formed from crystals that were unable to form. An example of a Fin Grained Igneous Rock is Basalt.
Other- Various other less common textures such as porphyritic texture(large and small grains), Glassy (Quick Cooled Magma) such as Obsidian, and Vesicular Textured (Rapidly cooled that created holes)
Fine Grained- Igneous Rocks that contains small crystals formed from crystals that were unable to form. An example of a Fin Grained Igneous Rock is Basalt.
Other- Various other less common textures such as porphyritic texture(large and small grains), Glassy (Quick Cooled Magma) such as Obsidian, and Vesicular Textured (Rapidly cooled that created holes)
Intrusion
Intrusion is when magma enters other rock masses and cools deep under earths crust. There are 3 main types: Batholith, Laccolith, Sill. At the left you can see a detailed and labeled diagram.
extrusion
Extrusion Igneous Rocks are rock masses that form on earth's surface. An example is lava flow and when lava flows up on earth's surface it creates a lava plateau.