Intrusive Igneous Rocks

Home Igneous Rocks Intrusive Igneous Rocks
Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by way of pre-present rock (called us of a rock); the magma cools slowly and, as a result, these rocks are coarse-grained.

Tuff

Phenotrachytic welded tuff
Phenotrachytic welded tuff Tuff is relatively soft and porous rock that made of ash and other sediments from...

Kimberlite

Kimberlite is an igneous rock that major source of diamonds. Kimberlite is a variety of peridotite.  It...

Pegmatite

Alkaline Pegmatite Rock have large crystal size minerals in it.
Pegmatite is an igneous rock that form end of the stage a magma’s crystallization. Pegmatites contain exceptionally large crystals and they contain rarely minerals than other types of rocks. They have interlocking crystals usually larger than 2.5 cm in size. Generally most Pegmatites are found in sheets of rock that are dikes and veins Also near large masses of igneous rocks called batholiths.

Diorite

Diorite is coarse – grained intrusive igneous rock that commonly mineralogy is plagioclase feldspar and dark colored minerals such as hornblende and biotite.It usually occurs dikes, sills and intrusions with continental crust . Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast.

Gabbro

Medium or coarse grained rocks, gabbros Dark green pyroxene in principle (augite and smaller orthopyroxene amounts plus white or green colored plagioclase and black, millimeter sized grains of magnetite and / or ilmenite.