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accessory mineral britannica

Accessory definition is an object or device that is not essential in itself but adds to the beauty, convenience, or effectiveness of something else How to use accessory in a sentence

Brassy yellow pyrite, often called fools gold, occurs variously as an accessory mineral in many rocks, in veins, and even as a chief component of some fossils Pyrrhotite, which typically has a bronzelike appearance and is slightly magnetic, is a common accessory mineral in mafic igneous rocks

Sep 05, 2012񎥷 Encyclopædia Britannica, Volume 2 Aplite The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon Biotite and all ferromagnesian minerals rarely appear in them, and never are in considerable amount Riebeckite granites paisanites have close affinities to aplites, shown especially in the

Primary minerals are often referred to as ore minerals These are the original formation of deposits In order for the mineral to be an ore mineral, it must pass some tests First, the concentrating processes based on the physical properties of the mineral include

Dec 07, 2017 The accessory minerals include sphene very frequent, apatite, zircon, magnetite and pyrites quartz as above stated is rarely absent but should never be abundant, otherwise the rock becomes a granite Nepheline and sodalite occur only in those rocks which show transitions to the nepheline syenites

List of the RockForming Minerals with Pictures, Chemistry, and Links to Separate Articles about each Mineral Species Sandatlas Calcium in the pills is in the form of calcite Calcite as a primary constituent of marble is widely used as a dimension stone Dolomite Monazite is an accessory mineral in felsic igneous rocks like granite Get Price

Accessory minerals present in relatively minor amounts include iron oxides and iron titanium oxides, such as magnetite, ulvöspinel, and ilmenite Because of the presence of such oxide minerals, basalt can acquire strong magnetic signatures as it cools, and paleomagnetic studies have made extensive use of basalt

Sep 09, 2014 Encyclopædia Britannica, Ninth Edition/Granite Again, some of the accessory minerals in granite would suffer change by an elevation of temperature, while many of them contain water which, it is assumed, would be expelled on fusion Probably, however, these minerals

By the various mineral combinations different species are produced, e g mica peridotite, hornblende peridotite, enstatite peridotite Of the accessory minerals the commonest are iron oxides and chromite or picotite In some peridotites these form segregations or irregular masses which are of importance as sources of the ores of chromium

Feb 26, 2019񎥷 Encyclopædia Britannica/Gneiss zircon and apatite There is also a long list of accessory minerals which are present in gneisses with more or less frequency, but not invariably, as garnet, sillimanite, cordierite, graphite and graphitoid, epidote, calcite, orthite, tourmaline and andalusite The gneisses all possess a more or less

Bibliography for Introduction 1 Minerals World of Biology Gale, 2006 Science in Context 2 accessory mineral Encyclopædia Britannica Encyclopædia Britannica Online Encyclopædia Britannica Inc , 2014 accessory minerals The American Heritage® Dictionary of the English Language, Fourth Edition 2003 Houghton Mifflin

Feldspars, quartz or feldspathoids, olivines, pyroxenes, amphiboles, and micas are all important minerals in the formation of almost all igneous rocks, and they are basic to the classification of these rocks All other minerals present are regarded as nonessential in almost all igneous rocks and are called accessory minerals

Aplite / ˈ æ p l aɪ t / is an intrusive igneous rock in which the mineral composition is the same as granite, but in which the grains are much finer, under 1 mm across Quartz and feldspar are the dominant minerals The term 'aplite' or 'aplitic' is often used as a textural term to describe veins of quartz and feldspar with a fine to medium grain sugary texture

Aug 28, 2018 The most common accessory constituent of granite is hornblende, a mineral which appears to replace to some extent the mica, and thus produces a hornblendic or syenitic granite This rock was formerly, and by some petrographers is still, termed syenite it is the syenites of Pliny, so named from Syene in Upper Egypt, where a smiliar rock was

Primary mineral, in an igneous rock, any mineral that formed during the original solidification crystallization of the rock Primary minerals include both the essential minerals used to assign a classification name to the rock and the accessory minerals present in lesser abundance

Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture It is the volcanic equivalent of syenite The mineral assemblage consists of essential alkali feldspar relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present See the QAPF diagram Biotite, clinopyroxene and olivine are common accessory minerals

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Zircon is a common accessory to trace mineral constituent of most granite and felsic igneous rocks Due to its hardness, durability and chemical inertness, zircon persists in sedimentary deposits and is a common constituent of most sands

Leucitite or leucite rock is an igneous rock containing leucite It is scarce, many countries such as England being entirely without them However, they are of wide distribution, occurring in every quarter of the globe Taken collectively, they exhibit a considerable variety of

The minerals present in a granulite will vary depending on the parent rock of the granulite and the temperature and pressure conditions experienced during metamorphism A common type of granulite found in high grade metamorphic rocks of the continents contains pyroxene, plagioclase feldspar and accessory garnet, oxides and possibly amphiboles

Among the accessory minerals may be mentioned apatite, magnetite, ilmenite, picotite and garnet A peculiar feature, repeated so constantly in many of the minerals of these rocks as to be almost typical of them, is the occurrence of small black or dark brown enclosures often regularly arranged parallel to certain crystallographic planes

Zircon, silicate mineral, zirconium silicate, ZrSiO 4, the principal source of zirconium Zircon is widespread as an accessory mineral in felsic igneous rocks It also occurs in metamorphic rocks and, fairly often, in detrital deposits It occurs in beach sands in many parts of the world, particularly Australia, India, Brazil, and Florida, and is a common heavy mineral in sedimentary rocks

Feb 26, 2019񎥷 Encyclopædia Britannica/Gneiss zircon and apatite There is also a long list of accessory minerals which are present in gneisses with more or less frequency, but not invariably, as garnet, sillimanite, cordierite, graphite and graphitoid, epidote, calcite, orthite, tourmaline and andalusite The gneisses all possess a more or less

Aplite / ˈ æ p l aɪ t / is an intrusive igneous rock in which the mineral composition is the same as granite, but in which the grains are much finer, under 1 mm across Quartz and feldspar are the dominant minerals The term 'aplite' or 'aplitic' is often used as a textural term to describe veins of quartz and feldspar with a fine to medium grain sugary texture

Entry for 'Aplite' 1911 Encyclopedia Britannica One of 8 Bible encyclopedias freely available, this resource contained over 40 million words in nearly 40,000 articles written by 1,500 respected authors

Bible Encyclopedias 1911 Encyclopedia Britannica Glauconite Resource Toolbox Many accessory minerals such as tourmaline and zircon have been identified also, while augite, hornblende and other volcanic minerals occur in varying proportion as in all the sediments of the open sea The depth in which they accumulate varies a good deal, viz

Accessory mineral: Accessory mineral, any mineral in an igneous rock not essential to the naming of the rock When it is present in small amounts, as is common, it is called a minor accessory If the amount is greater or is of special significance, the mineral is called a varietal, or characterizing, accessory and

Among the less common accessory minerals of the rhyolites are cordierite in crystals which resemble hexagonal prisms but break up under polarized light into six radiating sectors owing to complicated twinning: they weather to green aggregates of chlorite and muscovite pinite garnet, sphene and orthite may also be met with in rhyolites

In petrology, limburgite is a dark colored volcanic rock resembling basalt in appearance, but containing normally no feldspar The name derives from the type locality the Limberg or the Limburg, close to Sasbach am Kaiserstuhl in Baden Württemberg, where they

accessory mineral A mineral phase within a rock whose presence does not affect the root name of the rock For instance, the root name granite is defined by the presence of quartz, alkali feldspar, and mica These are the essential minerals The presence of the mineral sphene does not affect the root name and hence would be an example of an accessory mineral

Bible Encyclopedias 1911 Encyclopedia Britannica Gneiss zircon and apatite There is also a long list of accessory minerals which are present in gneisses with more or less frequency, but not invariably, as garnet, sillimanite, cordierite, graphite and graphitoid, epidote, calcite,

Jul 11, 2019 Mineral: Mineral, naturally occurring homogeneous solid with a definite chemical composition and a highly ordered atomic arrangement Usually formed by inorganic processes, there are several thousand known mineral species, about 100 of which constitute the major mineral

High quality example sentences with a common accessory in context from reliable sources Ludwig is the linguistic search engine that helps you to write better in English High quality example sentences with a common accessory in context from reliable sources Ludwig is the linguistic search engine that helps you to write better in

Dec 30, 2016 Among the accessory minerals may be mentioned spatite, magnetite, ilmenite, picotite and garnet A peculiar feature, repeated so constantly in many of the minerals of these rocks as to be almost typical of them, is the occurrence of small black or dark brown enclosures often regularly arranged parallel to certain crystallographic planes

Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture It is the volcanic equivalent of syenite The mineral assemblage consists of essential alkali feldspar relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present See the QAPF diagram Biotite, clinopyroxene and olivine are common accessory minerals

Bostonite, in petrology, is a fine grained, pale colored, grey or pinkish intrusive rock, which consists essentially of alkali feldspar orthoclase, perthite, anorthoclase, and albite Some samples may contain a small amount of interstitial quartz and others may have a small percentage of calcium present in a sodic plagioclase feldspar Accessory minerals include apatite, zircon and magnetite

Other articles where Secondary mineral is discussed: accessory mineral: the magma in contrast are secondary minerals, which form at a later time through processes such as weathering by hydrothermal alteration Common minor accessory minerals include topaz, zircon, corundum, fluorite, garnet, monazite, rutile, magnetite, ilmenite, allanite, and tourmaline

Sphene definition, a mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge shaped crystals See more

 
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