pyrite in mafic igneous rocks

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Mafic vs Felsic

What do the terms mafic and felsic mean? These are both made up words used to indicate the chemical composition of silicate minerals, magmas, and igneous rocks Mafic is used for silicate minerals, magmas, and rocks which are relatively high in the heavier elements The term is derived from using the MA from magnesium and the FIC from the Latin ....

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Bushveld Igneous Complex

The Bushveld Igneous Complex BIC is the largest layered igneous intrusion within the Earth s crust It has been tilted and eroded forming the outcrops around what appears to be the edge of a great geological basin the Transvaal BasinIt is approximately 2 billion years old and is divided into four different limbs the northern, southern, eastern, and western limbs...

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11 Hydrothermal Alteration

pyrite or pyrrhotite that lack economic value Hydrothermal alteration is defined as any alteration of rocks or minerals by the reaction of hydrothermal fluid with preexisting solid phas Hydrothermal alteration can be isochemical, like meta-morphism, and dominated by mineralogical changes, or it can...

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Description of Minerals and Rocks

Igneous rocks can also be classified by composition into felsic and mafi rocks Felsic igneous rocks are made up primarily of feldspar and quartz silica Mafic igneous rocks are made up primarily of minerals rich in iron and magnesium Felsic rocks are usually light to intermediate in color, and mafic igneous rocks are usually dark ....

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CLINOPYROXENE COMPOSITION, AN INDICATOR OF ,

In the Iberian Pyrite Belt clinopyroxene occurs fre 173 quently as a fresh igneous relict mineral in mafic and intermediate metavolcanic rocks By probing these pyroxenes, it may be possible to see through the effects of alteration and characterize the magma type as ,...

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Study 50 Terms Earth Science Flashcards Quizlet

Start studying GEOL107 Exam 1 Practice Exam Learn vocabulary, terms, and more with flashcards, games, and other study tools Search , a pyrite, hematite b hematite, pyrite c calcite, hematite , mafic igneous rock gabbro _____ a foliated metamorphic rock gneiss...

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Is pyrite igneous sedimentary or metamorphic

Pyrite could be found in any of the three rock types sedimentary, igneous, metamorphic...

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Mafic rock igneous rock Britannica

Mafic rock, in geology, igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour Mafic rock is commonly contrasted with felsic rock, in which...

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How to Classify Igneous Rocks Into Ultramafic, Mafic ,

Rocks composed mostly of hornblende and intermediate plagioclase feldspars make up the intermediate family of igneous rocks Intermediate magmas are somewhat more viscous than the mafic magmas Additionally, they contain somewhat more gas than do the mafic magmas, but not quite as much as the felsic magmas see below...

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UNIT 3 EXAM NAME ROCKS AND MINERALS BLOCK DATE

33Which intrusive igneous rock could be composed of approximately 60 pyroxene, 25 plagioclase feldspar, 10 olivine, and 5 amphibole? A white quartz B aluminum C pink feldspar D iron 34Compared to felsic igneous rocks, mafic igneous rocks contain greater amounts of A fine-grained and mafic B fine-grained and felsic...

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Vermont State Rocks and Rock Kit Department of ,

Marble is an important natural resource and has been a long-standing industry in Vermont Marble is one of the State Rocks of Vermont 7 Greenstone, Stowe Formation, Middlesex, VT The rock is a dark green, fine-to-medium-grained, massive greenstone mafic schist composed of chlorite, albite, epidote, actinolite, quartz and calcite...

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Mafic Vs Felsic Rocks Know the Difference

Difference Between Mafic and Felsic Rocks Igneous rocks consist of primarily 12 types of oxid The classification is done based on their silica content, as silica is usually the most abundant of all the oxides present Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic This is an order showing increased silica ....

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Mafic Layered Intrusions

Mafic Layered Intrusions and complexes including copper , Igneous Rocks is where the majority of copper nickel massive sulfide and chrome platinum group metal deposits developed in large intrusions that are , to tell whether that conductor was caused by copper and nickel sulfides or by some other conductor such as value less pyrite or ....

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A List of Extrusive Igneous Rocks Sciencing

An extrusive igneous rocks definition states these rocks form when magma exits and cools above or very near the Earth s surface Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria Komatiite is a very rare and old extrusive igneous rock...

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Ultrapotassic igneous rocks

Ultrapotassic igneous rocks are a class of rare, volumetrically minor and generally ultramafic or mafic silica-depleted igneous rocks Ultrapotassic rocks are defined by molar K 2 O/Na 2 O gt 3 in much of the scientific literature In other papers written as recently as 2005, they are defined as rocks with weight percents K 2 O/Na 2 O gt 2 Hence, caution is indicated in interpreting use of the ....

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Types of Wall Rock Alteration Mining Geology

Apr 30, 2015 0183 32 Carbonate rocks are characteristically recrystallized along the borders of a vein or near an igneous contact Conversely argillization may reduce permeability of a rock, leaving the orebody enclosed within a relatively impermeable shell , Pyrite is a standard alteration product around sulphide ore deposits since iron is one of the most ....

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The Minerals of Igneous Rocks

Amphibole is a rather common mineral in all igneous rocks, however, it is only abundant in the intermediate igneous rocks It occurs as slender needle-like crystals see image to the left It has good cleavage in 2 directions and hence has a stair-step appearance under a binocular microscope It is often confused with biotite and pyroxene...

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Igneous Rocks Flashcards Quizlet

Pyrite Fool s gold Halite Tastes like salt One can determine where an Igneous rock formed by observing its _____ Texture Oxygen Most common element found in minerals As igneous rocks become more mafic, they also become _____ A darker color As igneous rocks become more felsic, they also become _____ ....

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Unit 5 Reading Igneous Metamorphic Processes

Intrusive Igneous Rocks A rock formed when magma cools below the surface These rocks tend to have large, visible crystals because the magma cooled slowly Return to text Lava What geologists call magma when it erupts from a volcano Return to text Mafic Used to describe magma or igneous rock containing a low 45--51 proportion of silica ....

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Pyrite Earth Sciences Museum University of Waterloo

Originally the iron came from the weathering of older igneous or metamorphic rocks Iron is a common minor constituent of all continental igneous rocks and occurs in minerals such as ilmenite, magnetite and pyrite, and ferro-magnesian silicates like olivine, pyroxene, amphibole, and biotite mica...

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Bornite A mineral, an ore of copper, often called ,

It occurs in igneous, metamorphic, and sedimentary rocks Minable concentrations of bornite occur in hydrothermal veins, contact metamorphic zones, and in the enriched zone of many sulfide mineral deposits Chalcopyrite, marcasite, and pyrite are other sulfide minerals commonly associated with...

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Metamorphism of Mafic Rocks

1 l Mineral changes and associations along T-P gradients characteristic of the three facies series F Hydration of original mafic minerals generally required F If water unavailable, mafic igneous rocks will remain largely unaffected, even as associated sediments are completely re-equilibrated F Coarse-grained intrusives are the least permeable and likely to resist metamorphic changes...

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Pictures and Descriptions of Igneous Rock Types

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 rocksBy 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...

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GeoMan s Mineral Identification Metallic

Often called lodestone Common accessory mineral occurring as disseminated grains in mafic igneous rocks An ore of iron MAGNETITE Black to greenish 6 Pale brass SG 50 Often in cubic crystals Can be massive, granular Common name Fool s gold Commonly alters to limonite Sometimes mined as a source of sulfur PYRITE...

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Geology Igneous Rocks Flashcards Quizlet

Start studying Geology Igneous Rocks Learn vocabulary, terms, and more with flashcards, games, and other study tools...

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pyrite in igneous rocks

Pyrite is found in all types of rock igneous, metamorphic and sedimentary, as well as in hydrothermal vents It is formed in a variety of ways, with differing processes creating different forms of the rock with different sized crystals Is pyrite a sedimentary igneous or metamorphic rock Answers Apr 30, 2010 Pyrite is a mineral Yes, it can...

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Is pyrite formed in an igneous sedimentary or metamorphic ,

Pyrite could be found in any of the three rock types sedimentary, igneous, metamorphic Asked in Geology , Rocks and Minerals Is pyrite igneous sedimentary or metamorphic ?...

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1Base your answer to the following question on the graph ,

2 extrusive igneous rock with a fine texture and a mafic composition 3 intrusive igneous rock with a coarse texture and a felsic composition 4 intrusive igneous rock with a fine texture and a mafic composition 25Rock B is a dark-colored crystalline rock that formed when a lava flow cooled and solidified quickly on the surface of Earth...

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Is pyrite igneous, sedimentary or metamorphic? Study

Question Is pyrite igneous, sedimentary or metamorphic? Types of Rock Every rock on Earth can be classified into one of three categories depending on the way it forms...

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Ultramafic rock

Ultramafic rocks also referred to as ultrabasic rocks, although the terms are not wholly equivalent are igneous and meta-igneous rocks with a very low silica content less than 45 , generally gt 18 MgO, high FeO, low potassium, and are composed of usually greater than 90 mafic minerals dark colored, high magnesium and iron content The Earth s mantle is composed of ultramafic rocks...

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