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     routledgetextbooks.com

     • Felsic rocks are made of light-colored, low-density minerals such as quartz and feldspar. Mafic rocks are made of dark-colored, higher-density minerals such as olivine and pyroxene. Intermediate rocks have compositions between felsic and mafic. Ultramafic rocks contain more than 90% mafic minerals and have very few light, felsic minerals in them.
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     4.1: Igneous Rocks - Geosciences LibreTexts

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   What are felsic and mafic rocks?

   • felsic and mafic rocks, division of igneous rocks on the basis of their silica content. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements; igneous rocks typically consist of approximately 12 major oxides totaling over 99 percent of the rock.

   Felsic and mafic rocks | Igneous, Granitic & Rhyolitic Types

   www.britannica.com/science/felsic-rock

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   Why are igneous rocks classified as felsic?

   • Because of this abundance and because most igneous minerals are silicates, silica content was used as a basis of early classifications; it remains widely accepted today. Within this scheme, rocks are described as felsic, intermediate, mafic, and ultramafic (in order of decreasing silica content).

   Felsic and mafic rocks | Igneous, Granitic & Rhyolitic Types

   www.britannica.com/science/felsic-rock

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   What are the characteristics of mafic rocks?

   • Mafic rocks are dark in color and have a high density. They are typically composed of the following minerals: Felsic rocks are light in color and have a low density. They are typically composed of the following minerals: Felsic and mafic rocks are two important types of igneous rocks.

   Mafic Vs. Felsic: The Difference Between Mafic and Felsic

   www.geologyin.com/2023/09/mafic-vs-felsic-rocks-difference.html

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   What is the difference between mafic and felsic?

   • The term Mafic comes from "magnesium" and "ferric" (iron). Felsic is a term used to describe silicate minerals, magma, and igneous rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. The term "felsic" comes from the words "feldspar" and "silica,". Mafic Vs.

   Mafic Vs. Felsic: The Difference Between Mafic and Felsic

   www.geologyin.com/2023/09/mafic-vs-felsic-rocks-difference.html

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   What are igneous rocks made of?

   • The mineral compositions of igneous rocks are usually described as being felsic, intermediate, mafic, or ultramafic (as examples, see Figure 4.7 and Figure 4.8). Felsic rocks are made of light-colored, low-density minerals such as quartz and feldspar. Mafic rocks are made of dark-colored, higher-density minerals such as olivine and pyroxene.

   4.1: Igneous Rocks - Geosciences LibreTexts

   geo.libretexts.org/Courses/Lumen_Learning/Book:_Earth_Science_(Lumen)/04:_Rocks/4.01:_Igneous_Rocks

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   What is a felsic rock?

   • Definition: Felsic rocks are rich in silica (over 65%) and contain a high proportion of lighter minerals like quartz and feldspar. The term “felsic” derives from “feldspar” and “silica”. Characteristics: These rocks are generally light in color, ranging from white to pink or light grey. They have a high content of aluminum, potassium, and sodium.

   Igneous Rocks - Types, Properties, and Examples

   sciencenotes.org/igneous-rocks-types-properties-and-examples/

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3. www.britannica.com › science › felsic-rockFelsic and mafic rocks | Igneous, Granitic & Rhyolitic Types

   www.britannica.com › science › felsic-rock

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   Felsic and mafic rocks, division of igneous rocks on the basis of their silica content. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements; igneous rocks typically consist of approximately 12 major oxides totaling over 99 percent of the rock.

   • Mafic Rock

     Mafic rock is commonly contrasted with felsic rock, in...

   • Quartz Monzonite

     Quartz monzonite, intrusive igneous rock (solidified from a...

   • Syenite

     Syenite, any of a class of intrusive igneous rocks...

   • Intermediate

     Other articles where intermediate rock is discussed: felsic...

   • Ultramafic

     Ultramafic metamorphic rocks result from the metamorphism of...

   • Gabbro

     gabbro, any of several medium- or coarse-grained rocks that...

   • Peridotite

     Peridotite is the ultimate source of all chromium ore and...

4. sciencenotes.org › igneous-rocks-types-propertiesIgneous Rocks - Types, Properties, and Examples

   sciencenotes.org › igneous-rocks-types-properties

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   Jan 31, 2024 · Igneous rocks are classified based on their texture, mineral composition, and the environment of formation. The key factors include: Texture: Grain size, shape, and arrangement of crystals. Composition: Based on the silica content, they are categorized as felsic, intermediate, mafic, or ultramafic.

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6. geo.libretexts.org › Courses › Lumen_Learning4.1: Igneous Rocks - Geosciences LibreTexts

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   Felsic rocks are made of light-colored, low-density minerals such as quartz and feldspar. Mafic rocks are made of dark-colored, higher-density minerals such as olivine and pyroxene. Intermediate rocks have compositions between felsic and mafic.

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7. geo.libretexts.org › Bookshelves › Geology4.1: Classification of Igneous Rocks - Geosciences LibreTexts

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   For igneous rock, the composition is divided into four groups: felsic, intermediate, mafic, and ultramafic. These groups refer to differing amounts of silica, iron, and magnesium found in the minerals that make up the rocks.

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8. www.geologyin.com › 2023 › 09Mafic Vs. Felsic: The Difference Between Mafic and Felsic

   www.geologyin.com › 2023 › 09

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   Felsic and mafic rocks are two important types of igneous rocks. Their different physical and chemical properties are due to their different silica contents. Felsic rocks are high in silica, while mafic rocks are low in silica.

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     Geology: Felsic vs Mafic

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     Felsic and Mafic Igneous Rock

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10. openoregon.pressbooks.pub › earthscience › chapter4.3 Classification of Igneous Rocks – Principles of Earth Science

    openoregon.pressbooks.pub › earthscience › chapter

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    Igneous rocks are classified according to the relative abundances of minerals they contain. A given rock is represented by a vertical line in the diagram. In the mafic field, the arrows represent a rock containing 48% pyroxene and 52% plagioclase feldspar.

11. opentextbc.ca › 3-4-classification-of-igneous-rock3.4 Classification of Igneous Rock – Physical Geology – 2nd ...

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    As has already been described, igneous rocks are classified into four categories: felsic, intermediate, mafic, and ultramafic, based on either their chemistry or their mineral composition. The diagram in Figure 3.4.1 can be used to help classify igneous rocks by their mineral composition.