What Is Meant By The Texture Of An Igneous Rock?

What is the most common type of igneous rock?

The most common types of igneous rocks are:andesite.basalt.dacite.dolerite (also called diabase)gabbro.diorite.peridotite.nepheline.More items….

What are igneous rocks examples?

These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page.

What is the color 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 are the two types of igneous rock?

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 meant by the texture of a rock?

The texture of a rock is the size, shape, and arrangement of the grains (for sedimentary rocks) or crystals (for igneous and metamorphic rocks). Also of importance are the rock’s extent of homogeneity (i.e., uniformity of composition throughout) and the degree of isotropy. The…

What is the most common type of rock?

Sedimentary rocksSedimentary rocks are the most common rocks exposed on Earth’s surface but are only a minor constituent of the entire crust, which is dominated by igneous and metamorphic rocks.

What is an example of an extrusive igneous rock?

If the magma contains abundant volatile components which are released as free gas, then it may cool with large or small vesicles (bubble-shaped cavities) such as in pumice, scoria, or vesicular basalt. Other examples of extrusive rocks are rhyolite and andesite.

Why is the texture of a rock important?

Rocks have many different textures. … Analysis of texture can yield information about the rock’s source material, conditions and environment of deposition (for sedimentary rock) or crystallization and recrystallization (for igneous and metamorphic rock, respectively), and subsequent geologic history and change.

What is the texture of an igneous rock?

Igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic.

What is the texture of an extrusive igneous rock?

Igneous rocks which form by the crystallization of magma at the surface of the Earth are called extrusive rocks. They are characterized by fine-grained textures because their rapid cooling at or near the surface did not provide enough time for large crystals to grow.

What determines the texture of an igneous rock quizlet?

The texture of an igneous rock is determined by the cooling history of the magma from which it formed. Magmas that cool slowly form large crystals, and those that cool quickly form small crystals.

What is the most common type of extrusive rock?

The most common extrusive igneous rock is basalt, a rock that is especially common below the oceans (Figure 4.6). Figure 4.5: Extrusive or volcanic igneous rocks form after lava cools above the surface. Figure 4.6: These are examples of basalt below the South Pacific Ocean.

How can you identify an igneous rock?

Cooling of the magma can occur beneath the surface (plutonic) or on the surface (volcanic). Igneous rocks can be identified by the determination of the composition and texture of the rock. Once these two characteristics have been identified, the Igneous Rock Identification chart is used to identify the rock name.

What are the two most common kinds of igneous rock?

The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

What makes metamorphic rocks unique?

Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a “squashed” (foliated or banded) texture.