Igneous Rocks With Large Crystals

What are igneous rocks.

Igneous rocks with large crystals.

The size of the crystals depends on how quickly the molten magma solidified. Igneous rocks contain randomly arranged interlocking crystals. Rapid cooling results in smaller crystals while slow cooling results in large crystals. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite.

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 that are formed underground are called intrusive igneous rocks. Igneous rocks are formed from the solidification of molten rock material.

Magma that cools slowly will form an igneous rock with. In many igneous rocks large mineral crystals float in a fine grained groundmass. There are two basic types. 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.

The large grains are called phenocrysts and rock with phenocrysts is called a porphyry that is it has a porphyritic texture. Igneous rocks are of two types intrusive plutonic rocks and extrusive volcanic rocks.