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Igneous Rocks - Definition, Formation, Examples & Types ...

Granite is an example of a plutonic rock. Volcanic or extrusive rocks are formed when the magma reaches the surface either as lava or as fragmental ejectiles. Basalt and pumice are examples of volcanic or extrusive rocks. There is a third, though much rarer category of igneous rocks, named hypabyssal.

Igneous, Sedimentary and Metamorphic Rocks - Science Struck

Nov 24, 2018· There are two basic types of Igneous Rocks- Extrusive Igneous Rocks (Crystallize on the surface) | Intrusive Igneous Rocks (Crystallize underneath the surface) Examples of Extrusive Igneous Rocks (Volcanic) 1. Obsidian 2. Basalt 3. Andesite 4. Rhy...

Rocks: Igneous Rocks - SlideShare

Nov 15, 2018· Mafic: Igneous rocks derived from mafic magma contain 45-52% silica. Mafic rocks tend to be dark in color due to the presence of large amounts of iron and magnesium. Ultramafic: Igneous rocks derived from ultramafic magma contain less than 45% silica. Therefore, they are very dark and are very rare at the surface of the Earth. Igneous Rock Examples

Igneous rocks - Definition, Types, Examples ...

mafic igneous rocks have low silica forty five–fifty two% and typically high iron – magnesium content material (example gabbro and basalt), ultramafic rock igneous rocks with much less than forty five% silica (examples picrite, komatiite and peridotite), alkalic igneous rocks with 5–15% alkali (K2O + Na2O) content or with a molar ratio of ...

Igneous Rocks | National Geographic Society

Jun 03, 2019· Igneous rocks are those that form via the process of melting and cooling. If they erupt from volcanoes onto the surface as lava, they are called extrusive rocks.By contrast, Intrusive rocks are formed from magma that cools underground. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains.

Igneous Rocks | Types, Classification, Properties, Formation

Rocks are generally separated into one of three different categories: igneous, sedimentary, and metamorphic. The word igneous means that the rock became a solid after having originally been hot magma, or lava. These rocks are formed from the molten material found beneath the Earth's crust.

4.1: Classification of Igneous Rocks - Geosciences LibreTexts

Mar 27, 2020· Basalt is the most common igneous rock and forms much of the seabed. It's often black, but can be gray, brown, pale green or red. Ancient Egyptians used basalt as an ornamental stone. Obsidian forms when thick, hot lava cools quickly, before the minerals have a chance to crystallize. This gives the rock a glassy texture.

List of 29 Important Igneous Rocks | Geology

The rocks made from the cooling and solidifying of molten rock are called igneous rocks, and in this lesson, you will learn about the two categories of igneous rocks - volcanic and plutonic rocks ...

What Are Some Uses of Igneous Rocks? - Reference.com

Apr 29, 2020· An example of extrusive igneous rocks is Basaltic rock and they can be located in the North Eastern part of Nigeria. In the deep interior of the earth due to cooling, magma may be crystallized to form intrusive rock. If the magma moves its way to the …

Igneous Rocks: Definition, Formation, Types ...

Characteristics A body of intrusive igneous rock which crystallizes from magma cooling underneath the surface of the Earth is called a pluton.If the pluton is large, it may be called a batholith or a stock depending on the area exposed at the surface. If the body has an exposed surface area greater than 100 km2, then it's a batholith, otherwise it's a stock.

Igneous Rocks: Formation, Types and Examples | Earth Eclipse

The extrusive igneous rock equivalent of granite is rhyolite.: Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric.: Olivine occurs in an ultra-basic igneous rock called dunite.: Granite and rhyolite are types of igneous rock commonly interpreted as products of the melting of continental crust ...

Igneous Rocks Examples - Softschools.com

Nov 04, 2019· 4.1.3: Igneous Rock Bodies. Igneous rocks are common in the geologic record, but surprisingly, it is the intrusive rocks that are more common. Extrusive rocks, because of their small crystals and glass, are less durable. Plus, they are, by definition, exposed to the elements of …

Igneous Rocks: Formation Texture and Composition | Geology

Which of the following is an example of an extrusive igneous rock? a. rhyolite b. granite c. andesite d. coal. rhyolite. A rock that forms from cooling lava is classified as an _. a. intrusive igneous rock b. extrusive metamorphic rock c. extrusive igneous rock d. intrusive volcanic rock.

Igneous Rocks | Types, Classification, Properties, Formation

Dec 31, 2017· Acid Igneous Rocks - silica rich ( > 65% by weight) composed mainly of felsic or light coloured minerals (eg. feldspars, quartz) Hopefully this helps.

Types of Intrusive Igneous Bodies - Geology In

The following is an example of igneous rocks. It is not an all inclusive list but a brief pictorial list of some common igneous rocks. Igneous rocks get their name from the latin word for fire "igneus". The name is appropriate because these rocks are born of fire. Beneath the thin rocky crust of the earth is …

Pictures and Descriptions of Igneous Rock Types

Examples of intrusive igneous rocks are granite, diorite, gabbro, and peridotite. Intrusive igneous are used for a variety of purposes, including decoration, building, stonework, and jewelry.

Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types

Igneous Rock # 1. Granite: Granite and other rocks of the granite family are the most widely distributed of the deeper plutonic igneous rocks forming the major component of the earth's crust. It is a light coloured rock. The dominant mineral of the rock is alkali feldspar which occurs as large crystals.