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Igneous Rocks       Article     History   Tree Map
  Encyclopedia of Keywords > Nature > Matter > Materials > Rocks > Igneous Rocks   Michael Charnine

Keywords and Sections
VOLCANOES
MINERALOGY
CHEMISTRY
NAKED EYE
FELDSPAR
GRAINS
UNDERGROUND
GEOLOGY
GEOLOGISTS
MOLTEN ROCK
BENEATH
FORMING
COMPOSITIONS
COMPOSITION
FELSIC
PHONOLITE
GRANITE ROCKS
METEORITES
FORSTERITE
ALTERATION
SECONDARY MINERAL
MAIN CATEGORIES
MAGNESIUM
DEPOSITS
PLACER DEPOSITS
IRON
SKARNS
PHANERITIC TEXTURE
VISIBLE CRYSTALS
AMPHIBOLITES
IMPORTANT CONSTITUENT
SEDIMENTARY ROCKS
MINOR CONSTITUENT
PARTIAL MELTING
DECOMPRESSION MELTING
CALCITE
MARBLES
EXTRUSIVE
INTERMEDIATE
SILICA CONTENT
ANDESITE
GABBRO
DESCRIPTIVE TERM
EROSION
SURFACE
TYPES
Review of Short Phrases and Links

    This Review contains major "Igneous Rocks"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. Igneous rocks are classified according to mode of occurrence, texture, mineralogy, chemical composition, and the geometry of the igneous body.
  2. Igneous rocks are those which crystallize from a silicate or other type of “magma” (molten rock) either deep underground or near the surface.
  3. Igneous rocks (etymology from Latin ignis, fire) are rocks formed by solidification of cooled magma (molten rock). (Web site)
  4. Igneous rocks are formed by the solidification of magma, a silicate liquid generated by partial melting of the upper mantle or the lower crust. (Web site)
  5. Igneous rocks are formed when molten magma cools and are divided into two main categories: plutonic rock and volcanic. (Web site)

Volcanoes

  1. Igneous rocks are those rocks that form from hot magma erupting from volcanoes or slowly intruding into the subsurface.
  2. Some igneous rocks erupt from volcanoes as lava or pumice. (Web site)

Mineralogy

  1. MINERALOGY Most of the minerals in igneous rocks and many minerals in sedimentary rock can occur in metamorphic rocks. (Web site)
  2. The field identification of igneous rocks is based on color, density, composition (mineralogy), grains size and texture. (Web site)
  3. To learn more about textures and mineralogy of igneous rocks click on the links below. (Web site)

Chemistry

  1. Igneous rocks are classified on the basis of mineralogy, chemistry, and texture. (Web site)
  2. Igneous Rocks have a two-dimensional classification scheme based on chemistry, grain size and texture.
  3. The classification scheme below is based on chemistry, and is perhaps the simplest method; there are many other classification methods for igneous rocks. (Web site)

Naked Eye

  1. In contrast, fine-grained rocks, such as basalt, are igneous rocks that have crystals too fine to see with the naked eye. (Web site)
  2. Igneous rocks with a porphyritic texture show two distinct grain sizes—coarse-grained crystals, visible to the naked eye, surrounded by fine-grained.
  3. As mentioned above, intrusive igneous rocks, such as granite have large, individual crystals visible to the naked eye. (Web site)

Feldspar

  1. Light-colored igneous rocks (pumice, rhyolite & granite) are composed of larger amounts of silica and are said to be felsic (feldspar + silica).
  2. Feldspar is a widespread mineral especially common in igneous rocks such as granite.
  3. Feldspar A common mineral occurring in igneous rocks that sometimes erodes out and becomes incorporated into sedimentary rocks. (Web site)

Grains

  1. Some potassium feldspar is white like plagioclase, but is usually a safe bet to identify any frosty white grains in igneous rocks as plagioclase.
  2. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites. (Web site)
  3. In mafic igneous rocks the olivine is found as isolated grains surrounded by pyroxene and Ca plagioclase. (Web site)

Underground

  1. Metamorphic rocks form when sedimentary or igneous rocks are altered by heat and pressure deep underground.
  2. Igneous rocks are called fire rocks and are formed either underground or aboveground.
  3. Most igneous rocks that form deep underground contain a small amount of magnetite crystals. (Web site)

Geology

  1. This is evidenced by the abundant basalt and other igneous rocks that define the geology of the Galilee region. (Web site)

Geologists

  1. Understanding of Bowen’s Reaction Series helps geologists to understand the great diversity of igneous rocks found on Earth. (Web site)
  2. Bodies of igneous rocks come in a large variety of shapes and sizes, and geologists use a variety of terms to describe these. (Web site)

Molten Rock

  1. Igneous rocks (from the Greek word for fire) form from when hot, molten rock (magma) crystallizes and solidifies.
  2. Igneous rocks are classed on the basis of where they form and the compostion of the molten rock.
  3. With intrusive igneous rocks the molten rock cools before it reaches the surface. (Web site)

Beneath

  1. When magma cools and solidifies beneath the surface of the Earth intrusive or plutonic igneous rocks are formed. (Web site)

Forming

  1. The magma or lava then cools, forming more igneous rocks. (Web site)

Compositions

  1. Igneous Geochemistry - Compositions of volcanic and other igneous rocks in a world wide data base.
  2. The pictures below illustrate the significant textures and compositions that enable geologists and geology students to classify igneous rocks. (Web site)

Composition

  1. Composition of the magma will determine the minerals that will crystallize forming different types of igneous rocks.
  2. The composition of igneous rocks and minerals can be determined via a variety of methods of varying ease, cost, and complexity.
  3. The rocks vary in composition from granitics (igneous rocks) to the metamorphosed peridotites (serpentine). (Web site)

Felsic

  1. On the other hand, those made of lightly colored, less-dense minerals, such as quartz, mica, and feldspar, are called felsic igneous rocks. (Web site)
  2. Quartz is an essential constituent of granite and other felsic igneous rocks. (Web site)
  3. Orthoclase is a common constituent of most granites and other felsic igneous rocks and is often found in huge crystals and masses in pegmatite veins. (Web site)

Phonolite

  1. The latter two are dark green minerals, which occur as original constituents of igneous rocks rich in sodium, such as nepheline - syenite and phonolite. (Web site)

Granite Rocks

  1. Granite rocks are igneous rocks which were formed by slowly cooling pockets of magma that were trapped beneath the earth's surface. (Web site)

Meteorites

  1. Diopside is an important rock forming mineral in several metamorphic and basic to ultra basic igneous rocks, also found in meteorites.
  2. It occurs in metamorphic and igneous rocks and in meteorites. (Web site)

Forsterite

  1. Forsterite is associated with igneous rocks and has also been found in some iron meteorites. (Web site)
  2. Hence, the crystallizing olivine was Mg-rich, and igneous rocks rich in forsterite were formed. (Web site)

Alteration

  1. Alteration of igneous rocks is common with widespread albite, orthoclase, and scapolite veins and replacements, in addition to endoskarn. (Web site)
  2. Green and darkgreen are the prevalent tints of the hornfels produced by the alteration of igneous rocks.

Secondary Mineral

  1. Tanzanite develops in fissures of igneous rocks as a secondary mineral through alteration of the minerals, where the surrounding rock is composed. (Web site)
  2. They are considered secondary mineral in cavities and seams of igneous rocks.
  3. It occurs as a secondary mineral in mafic igneous rocks often filling vesicles along with zeolites in basalt. (Web site)

Main Categories

  1. Igneous rocks can be classified into two main categories: intrusive and extrusive. (Web site)

Magnesium

  1. Mafic magma produces igneous rocks rich in calcium, iron, and magnesium and are relatively poor in silica (silica amounts from 45 to 52%).

Deposits

  1. In Canada, chrysotile occurs as veins within deposits of igneous rocks rich in iron and magnesium.
  2. Deposits in igneous rocks can also occur as lenses and pods, and in fractures, faults and fissures. (Web site)

Placer Deposits

  1. Hydrothermal ore deposits of gold occur in metamorphic rocks and igneous rocks; alluvial deposits and placer deposits originate from these sources.

Iron

  1. Weathering of Rocks Weathering of Rocks - Igneous rocks are composed of alumino-silicates of metals such as iron, calcium, magnesium and sodium.
  2. Comments: The iron and titanium oxide mineral ilmenite is present in small amounts in many igneous rocks and placer sands and is the principal titanium ore.
  3. Many titaniumiron (vanadium) deposits in China are related to igneous rocks (table 2), and are a major source of iron and titanium. (Web site)

Skarns

  1. Diopside is a calcium and magnesium silicate (CaMgSi 2 O 6) that occurs in metamorphosed siliceous limestones and dolomites, in skarns, and in igneous rocks. (Web site)
  2. Because solutions tend to have high temperatures close to a magma chamber, most skarns are found immediately adjacent to intrusive igneous rocks. (Web site)

Phaneritic Texture

  1. Igneous rocks which are totally composed of large crystals (visible to the naked eye) are described as having a phaneritic texture.
  2. Phaneritic Texture: Intrusive igneous rocks produced from magma that has cooled and crystallized underground (e.g.

Visible Crystals

  1. Igneous rocks can have visible crystals, but they are not orderly like metamorphic rock.

Amphibolites

  1. In the Delaware Piedmont most amphibolites are formed by the metamorphism of igneous rocks. (Web site)
  2. It is common in rocks formed by the medium to high-grade metamorphism of impure limestones and basic igneous rocks to give amphibolites.

Important Constituent

  1. It is a very widespread mineral which occurs as an important constituent of igneous rocks which have an excess of silica.
  2. Hornblende is an important constituent of many igneous rocks. (Web site)

Sedimentary Rocks

  1. These minerals are almost unheard of in igneous rocks and in sedimentary rocks because they only form under conditions of extreme temperature and pressure.
  2. Geologists, scientists who study Earth and rocks, divide rocks into three main groups: igneous rocks, sedimentary rocks, and metamorphic rocks. (Web site)
  3. Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary rocks. (Web site)

Minor Constituent

  1. It occurs as a minor constituent of many igneous rocks and is frequently associated with epidote.
  2. CaTiO 3 perovskite occurs primarily as a minor constituent of some igneous rocks in the Earth's crust and mantle and in some meteorites. (Web site)

Partial Melting

  1. Silica-undersaturated igneous rocks typically are formed by low degrees of partial melting in the Earth's mantle. (Web site)

Decompression Melting

  1. Basalt magmas form by decompression melting of peridotite in the Earth's mantle, a process discussed in the entry for igneous rocks. (Web site)

Calcite

  1. It is found in the cavities of basic igneous rocks and often associated with calcite.

Marbles

  1. They are common in basic igneous rocks but may also be developed by metamorphic processes in gneisses, schists, and marbles. (Web site)
  2. Apatite has a hexagonal structure and occurs widely in igneous rocks, such as pegmatite, and in contact metamorphic rocks, such as marbles. (Web site)

Extrusive

  1. Igneous rocks (volcanites) are shaped about the earth's floor or quickly underneath, and are known as extrusive magmatites or extrusive igneous rocks.
  2. Extrusive Igneous rocks can be classified into two main categories: intrusive and extrusive. (Web site)
  3. Volcanic or extrusive igneous rocks wherein the magma cools and crystallizes.

Intermediate

  1. Andesine occurs in intermediate igneous rocks such as diorite, syenite and andesite. (Web site)
  2. Plagioclases make up 15 % of the coarse fraction, and their composition is within the range of plagioclases found in mafic and intermediate igneous rocks. (Web site)
  3. Geologists have classified the chemistry of igneous rocks into four basic types: felsic, intermediate, mafic, and ultramafic. (Web site)

Silica Content

  1. Igneous rocks contain mostly silicate minerals and are sometimes classified according to their silica content.
  2. Igneous rocks are also classified as acid or basic, according to whether their silica content is high (e.g. (Web site)

Andesite

  1. Both andesite and diorite are igneous rocks with an intermediate color index.
  2. The composition of andesite is classified as " intermediate " among igneous rocks, implying that its silica content is in the range of 52-63 percent. (Web site)
  3. Common examples of igneous rocks are basalt (an extrusive rock), granite (an intrusive rock) and andesite (a hypabyssal rock).

Gabbro

  1. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.
  2. Gabbro and granite are examples of these coarse-grained types of igneous rocks, which are also referred to as phaneritic. (Web site)
  3. In many mafic igneous rocks, such as gabbro and diabase, scapolite replaces feldspar by a secondary or metasomatic process. (Web site)

Descriptive Term

  1. Basic - A descriptive term for igneous rocks containing less than about 52 percent silica (SiO 2).

Erosion

  1. Layers of soil and other rocks above intrusive igneous rocks are often worn away due to erosion and weathering. (Web site)
  2. The igneous rocks formed as the magma cools are usually relatively resistant and, after erosion, they stand out in the landscape. (Web site)
  3. The nonconformity can only occur if all of the rocks overlying the metamorphic or intrusive igneous rocks have been removed by erosion. (Web site)

Surface

  1. Extrusive rocks are igneous rocks that have formed (and cooled more quickly) at the surface of the Earth (like obsidian). (Web site)
  2. When igneous rocks are exposed at the surface they are subject to weathering (chemical and mechanical processes that reduce rocks to particles). (Web site)
  3. Extrusive igneous rocks form when the magma or molten rock pours out onto the earth's surface or erupts at the earth's surface from a volcano. (Web site)

Types

  1. Apart from these two types of igneous rocks, there are other kinds which are rare or let's say, less common.
  2. There are two types of igneous rocks: intrusive and extrusive. (Web site)
  3. Magmatic differentiation can produce a variety of types of igneous rocks through evolution of the original parent magma.

Categories

  1. Nature > Matter > Materials > Rocks
  2. Magma
  3. Basalt
  4. Granite
  5. Encyclopedia of Keywords > Nature > Natural Resources > Minerals

Subcategories

Andesite
Diorite
Gabbro
Obsidian
Pumice
Scoria

    Related Keywords

      * Abundant * Accessory Mineral * Accessory Minerals * Associated * Basalt * Basalts * Carbonatites * Classification * Common * Common Accessory Mineral * Common Igneous Rocks * Common Mineral * Cool * Cooling * Crust * Crystals * Earth * Extrusive Igneous Rocks * Feldspathoids * Form * Gabbros * Granite * Granites * Ilmenite * Intrusive Igneous Rocks * Lava * Lavas * Magma * Magmas * Mantle * Melt * Metamorphic Rocks * Mineral * Minerals * Molten Magma * Molten Rock Material * Nepheline Syenite * Nepheline Syenites * Occurrence * Olivine * Pegmatites * Primary Mineral * Quartz * Result * Rock * Rocks * Silica * Silicate Minerals * Sio2 * Solidification * Texture * Textures * Ultramafic Igneous Rocks * Volcanic * Volcanic Igneous Rocks
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