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In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements. The term is a combination of "magnesium" and ferrum, the Latin word for iron [ma(gnesium) + f(errum) + ic] [1]. In spite of the name, mafic magmas also are rich in calcium and sodium. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history and the processes that shape it. ... The silicate minerals make up the the largest and most important class of rock-forming minerals. ... Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. ... This article is about volcanoes in geology. ... Pluton redirects here. ... Volcanic rock on North America Plutonic rock on North America Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... A chemical element, often called simply element, is a chemical substance that cannot be divided or changed into other chemical substances by any ordinary chemical technique. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40. ... General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ...


Mafic minerals are usually dark in color and have a specific gravity greater than 3. Common rock-forming mafic minerals include olivine, pyroxene, amphibole, biotite and other micas, augite and the calcium-rich plagioclase feldspars. Common mafic rocks include basalt and gabbro. Relative density (also known as specific gravity) is a measure of the density of a material. ... Olivine The mineral olivine is a magnesium iron silicate with the formula (Mg,Fe)2SiO4 in which the ratio of magnesium and iron varies between the two endmembers of the series: forsterite (Mg-rich) and fayalite (Fe-rich). ... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... For the logical fallacy, see Amphibology. ... A Biotite slice Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. ... rock with mica Mica sheet mica flakes The mica group of minerals includes several closely related materials having highly perfect basal cleavage. ... Augite is a mafic mineral described chemically as (Ca, Na)(Mg, Fe, Al)(Al, Si)2O6 or calcium sodium magnesium iron aluminium silicate. ... Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Feldspar is the name of an important group of rock-forming minerals which make up perhaps as much as 60% of the Earths crust. ... Basalt Basalt is a common gray to black volcanic rock. ... Gabbro specimen. ...


In terms of chemistry, mafic rocks are on the other side of the rock spectrum from the so-called felsic rocks. The term roughly corresponds to the older basic rock class. Felsic is a term used in geology to refer to silicate minerals, magmas, and rocks which are enriched in the lighter elements, such as silica, oxygen, aluminium, sodium, and potassium. ...


Mafic lava, before cooling, has a lower viscosity than felsic lava due to its lower silica content. Water and other volatiles can more easily and gradually escape from mafic lava, so eruptions of volcanoes made of mafic lavas are less explosively violent than felsic lava eruptions. Most mafic lava volcanoes are oceanic volcanoes, like Hawaii. The pitch drop experiment at the University of Queensland. ... Felsic is a term used in geology to refer to silicate minerals, magmas, and rocks which are enriched in the lighter elements, such as silica, oxygen, aluminium, sodium, and potassium. ... Official language(s) Hawaiian and English Capital Honolulu Largest city Honolulu Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 43rd 28,337 km² n/a km 2,450 km 41. ...

Rock Texture Name of Mafic Rock
Pegmatitic Gabbro pegmatite
Coarse grained (phaneritic) Gabbro
Coarse grained and porphyritic Porphyritic gabbro
Fine grained (aphanitic) Basalt
Fine grained and porphyritic Porphyritic basalt
Pyroclastic Basalt tuff or breccia
Vesicular Vesicular basalt
Amygdaloidal Amygdaloidal basalt
Many small vesicles Scoria
Glassy Tachylyte, sideromelane, palagonite

Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... Gabbro specimen. ... Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... Phaneritic is a term usually used to refer to igneous rock grain size. ... Gabbro specimen. ... (For other meanings of Porphyr, see Porphyry) The baptismal font in the Cathedral of Magdeburg is made of rose porphyry from a site near Assuan, Egypt Porphyry is a very hard red, green or purple igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a... Gabbro specimen. ... An aphanite is an igneous rock with a fine-grained structure. ... Basalt Basalt is a common gray to black volcanic rock. ... Basalt Basalt is a common gray to black volcanic rock. ... Pyroclastic rocks are formed from lavas which are ejected into the air, as occur in pyroclastic flows or Plinian eruptions. ... Basalt Basalt is a common gray to black volcanic rock. ... Welded tuff at Golden Gate in Yellowstone National Park Tuff (from the Italian tufo and pronounced tuf) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. ... Breccia, derived from the Latin word for broken, is a sedimentary rock composed of angular fragments in a matrix that may be of a similar or a different material. ... Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles. ... Basalt Basalt is a common gray to black volcanic rock. ... Amygdaloid, derived from the Latin for almond, can refer to: the amygdala in the brain. ... Basalt Basalt is a common gray to black volcanic rock. ... Scoria Scoria is a type of igneous rock containing many gas bubbles, or vesicules. ... Tachylyte is a vitreous form of basaltic obsidian (volcanic glass). ... Sideromelane is a vitreous basaltic volcanic glass, usually occurring in palagonite tuff, for which it is characteristic. ... Palagonite is a form of volcanic glass similar to obsidian but with a chemical composition more closely related to basalt. ...

See also


  Results from FactBites:
 
Welcome to Mafic Studios, Inc.! (292 words)
Mafic Studios is a 3D animation company based in Sudbury, Ontario, Canada.
In March 2005, Mafic Studios created its first image for Popular Science, illustrating the feature article, on Bigelow Aerospace.
Since then, we have illustrated nine articles, which have appeared in the March, June, July, August and September issues, with several images due to appear in the near future.
Mafic - Wikipedia, the free encyclopedia (213 words)
In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements.
Mafic minerals are usually dark in color and have a specific gravity greater than 3.
In terms of chemistry, mafic rocks are on the other side of the rock spectrum from the so-called felsic rocks.
  More results at FactBites »

 
 

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