Igneous Rocks With Large Crystals

The size of the crystals depends on how quickly the molten magma solidified.

Igneous rocks with large crystals.

Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. They are characterized by large crystals mostly visible with the naked eye. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. What are igneous rocks.

Igneous rocks are formed from the solidification of molten rock material. Igneous rock derived from the latin word ignis meaning fire or magmatic rock is one of the three main rock types the others being sedimentary and metamorphic igneous rock is formed through the cooling and solidification of magma or lava the magma can be derived from partial melts of existing rocks in either a planet s mantle or crust typically the melting is caused by one or more of. Igneous rocks contain randomly arranged interlocking crystals. Intrusive igneous rocks are formed when the magma cools off slowly under the earth s crust and hardens into rocks.

Igneous rocks that are formed underground are called intrusive igneous rocks. Rapid cooling results in smaller crystals while slow cooling results in large crystals. There are two basic types. Types of igneous rocks.

Phenocrysts are minerals that solidified earlier than the rest of the rock and they are important clues to the rock s history. Igneous rocks are of two types intrusive plutonic rocks and extrusive volcanic rocks.