What Are The Textures Of Igneous Rocks?

What factors influence the texture of igneous rocks?

A: Water content, silicate content, and the most important part speed of cooling are the three factors that influence the texture of igneous rocks..

What do igneous rocks tell us?

The chemical composition of an igneous rock tells us about the origin of the magma, beginning with which type of rock melted within the earth to form the magma in the first place, and how deep in the earth the melting occurred. … The igneous texture tells us how the magma cooled and solidified.

What are the main features of igneous rocks?

Characteristics of Igneous Rocks The igneous form of rocks does not include any fossil deposits. … Most of the igneous forms include more than one mineral deposit. They can be either glassy or coarse. These usually do not react with acids.More items…•

What is meant by the texture of an igneous rock?

Geologists like igneous textures because they reveal so much about how a rock formed. The first set of textures focuses on the size of mineral crystals. Crystal size primarily reflects the rate of cooling, but is also often strongly affected by rock composition (especially water or gas content).

What are the 4 textures and compositions of igneous rocks?

As has already been described, igneous rocks are classified into four categories, based on either their chemistry or their mineral composition: felsic, intermediate, mafic, and ultramafic. The diagram in Figure 3.16 can be used to help classify igneous rocks by their mineral composition.

What is the structure of igneous rock?

Introduction to Igneous Rocks An igneous rock is any crystalline or glassy rock that forms from cooling of a magma. A magma consists mostly of liquid rock matter, but may contain crystals of various minerals, and may contain a gas phase that may be dissolved in the liquid or may be present as a separate gas phase.

What does a igneous rock feel like?

As a result this texture typically has a gritty feel, and the rock contains tiny bits of fragmented material. A vesicular texture is caused when dissolved gases and other volatile components of a magma erupt from the liquid portion due to a decrease in pressure.

What is the Colour of igneous rock?

There are three basic rock types: Igneous, sedimentary, and metamorphic….Igneous Rock Charts.Color>Extrusive volcanicLight colored: Pink, white, Gray, Green, LavenderRhyoliteMedium to Dark Colored: Purple, GreenishAndesiteDark Gray to BlackBasaltDark Green to BlackKomatite4 more columns

What is igneous rock with example?

Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.

What are the 3 characteristics of igneous rocks?

Types of Igneous Rocks The type of igneous rocks that form from magma is a function of three factors: the chemical composition of the magma; temperature of solidification; and the rate of cooling which influences the crystallization process. Magma can vary chemically in its composition.

What are the 2 main types of igneous rocks?

Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies. Intrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth.

What is another name for igneous rocks?

Igneous rocks are also known as magmatic rocks. Igneous rocks are divided into two types: plutonic and volcanic rock. Plutonic rock is another name…