What are the six major igneous rock textures quizlet?

There are six common igneous rock textures:

aphanitic (fine grained)
phaneritic (coarse grained)
porphyritic (coarse grained and fine grained)
glassy or vesicular/frothy (glass or gas bubbles)
pyroclastic (rock fragments/ash welded together)
pegmatitic (large minerals, >2 cm)

What are the 7 different textures one can use to describe igneous rocks?

There are nine main types of igneous rock textures: Phaneritic, vesicular, aphanitic, porphyritic, poikilitic, glassy, pyroclastic, equigranular, and spinifex. Each kind of texture has a variety of different characteristics that make them unique.

What is the texture of igneous rock?

The texture of an igneous rock made up entirely of crystals big enough to be easily seen with the naked eye is phaneritic. Phaneritic texture is sometimes referred to as coarse-grained igneous texture. Granite, the most well known example of an intrusive igneous rock, has a phaneritic texture.

What are the 6 different types of intrusive rock bodies?

Intrusive Structures

Dikes. A dike is an intrusive rock that generally occupies a discordant, or cross‐cutting, crack or fracture that crosses the trend of layering in the country rock. …
Sills. …
Laccoliths. …
Volcanic necks. …
Plutons.

Is glassy a texture?

If a rock looks like a block of (colored) glass, with no visible mineral crystals, it has a glassy texture. Superficially, a glassy texture suggests cooling that was so extremely fast that no crystals could form.

What is the texture of an igneous rock formed from magma that cooled slowly deep underground?

Magmas and their resultant plutonic rock bodies cool and crystallize slowly and are characterized by coarse-grained texture, in which the mineral crystals are visible to the unaided eye.

What are the 5 textures of igneous rocks?

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

Which are the 4 types of texture for igneous rocks?

Igneous Rock Textures

COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)

What are the major intrusive igneous bodies?

Common igneous rock types include granite, gabbro, and diorite. Large plutons can form along convergent tectonic plate boundaries.

What are three igneous textures that are crystalline?

The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. Examples of phaneritic igneous rocks are gabbro, diorite, and granite.

What texture is basalt?

Basalts have almost always aphanitic or fine-grained mineral texture resulting from rapid cooling of volcanic magma.

What is the texture of an igneous rock formed from magma that?

The magma, called lava when molten rock erupts on the surface, cools and solidifies almost instantly when it is exposed to the relatively cool temperature of the atmosphere. Quick cooling means that mineral crystals don't have much time to grow, so these rocks have a very fine-grained or even glassy texture.

What type of igneous rock texture has large minerals?

Phaneritic Phaneritic – This texture describes a rock with large, easily visible, interlocking crystals of several minerals.

What are the 4 textures of igneous rock?

Igneous Rock Textures

COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)

What are the 3 major texture categories?

Thus there are distinct igneous textures, distinct sedimentary texture, and distinct metamorphic textures.

How many types of igneous rocks are there?

two groups 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 the texture of intrusive igneous rocks?

Intrusive rocks have a coarse grained texture. Extrusive Igneous Rocks: Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth's surface. These are the rocks that form at erupting volcanoes and oozing fissures.

What are the types 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 are the 4 textures of igneous rocks?

Igneous Rock Textures

COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)

What is the texture of granite?

Phaneritic Granite

Type	Igneous rock
Texture	Phaneritic (Coarse-grained)
Origin	Intrusive/Plutonic
Chemical Composition	Felsic
Color	Predominantly white

What is the texture of 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.

What are the 4 types 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.

What are the four textures of igneous rocks?

Igneous Rock Textures

COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)

What are the major types of igneous rocks?

How are igneous rocks formed 7?

1. Igneous rocks: Lava is the hot molten magma that reaches the Earth's surface through cracks and crevices during a volcanic eruption. This cools down and solidifies below the Earth's surface or on it to form rocks. These rocks are known as igneous rocks.

What are five examples of igneous rock?

Types of extrusive igneous rocks include: pumice, obsidian, andesite, rhyolite, and basalt.