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  Encyclopedia of Keywords > Nature > Natural Resources > Minerals > Quartz   Michael Charnine

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  1. Quartz is a common constituent of granite, sandstone, limestone, and many other igneous, sedimentary, and metamorphic rocks.
  2. Quartz is a family of minerals with the same chemical composition (silicon dioxide) and similar physical properties.
  3. Quartz is the most common mineral on earth (second most common if Water is considered a mineral).
  4. Quartz is the second most abundant mineral in the Earth 's continental crust, after feldspar.
  5. Quartz is a crystalline form of silicon dioxide, opal is a solid gel.


  1. Aegirine-augite, albite, biotite, nepheline, quartz, tourmaline.
  2. Associated Minerals are quartz, feldspars, nepheline, micas and aegirine.


  1. Values for the Mohs scale are as follows: talc 1; gypsum 2; calcite 3; fluorite 4; apatite 5; orthclase 6; quartz 7; topaz 8; corundum 9; diamond 10.
  2. Some other minerals found here are quartz, apatite, morganite, clevelandite, calcite, lepidolite, feldspar, stibiotantalite, topaz, and spessartine garnet.
  3. Minerals: Beryl (green, white, pink), Amazonite, Aquamarine, Tourmaline (green, black), smoky quartz, garnet, apatite, fluorite, many more.


  1. The gneiss contains varying amounts of pyroxene, hornblende, plag & quartz with minor magnetite and bio.
  2. Feldspar is the most important mineral that makes up gneiss along with mica and quartz.
  3. In metamorphic rocks such as gneiss, quartz becomes concentrated in bands and veins.


  1. In phaneritic rocks the texture is referred to as GRANOBLASTIC. Common granoblastic rocks included QUARTZITE (quartz), and MARBLE (calcite or dolomite).
  2. Locally veinlike aggregates of quartz are developed at the contact, and masses of quartzite up to a foot in diameter are included in the granite.
  3. Quartzite: Consists of recrystallized quartz and forms from sandstone.


  1. Pegmatite is a coarse-grained granite with large crystals of quartz, feldspar and mica.
  2. The pegmatite is composed of intergrowths of quartz, microcline feldspar, and muscovite mica.
  3. The pegmatite generally consist of plagioclase feldspar, quartz but in few cases it also contain garnet, tourmaline, and beryl.


  1. Pegmatites have the typical appearance of igneous rocks with randomly distributed interlocking crystals such as quartz, feldspar and mica.
  2. Most pegmatites are composed of quartz, feldspar and mica; in essence a " granite ".
  3. Pegmatites are bodies of rock commonly of granitic composition that consist mainly of unusually large crystals or masses of quartz, feldspar, and mica.

Orthoclase Feldspar

  1. Other mineral components of granodiorite include quartz, orthoclase feldspar, and, to a lesser extent, hornblende, biotite, apatite, and sphene.
  2. The main minerals evident in the rock are white orthoclase feldspar, quartz, biotite and muscovite.
  3. Granite: A coarse-grained, intrusive igneous rock composed of quartz, orthoclase feldspar, sodic plagioclase feldspar, and micas.

Quartz Monzonite

  1. Quartz Monzonite Porphyry - Quartz monzonite is a granitic rock that is primarily composed of quartz, plagioclase feldspar, and orthoclase feldspar.
  2. Quartz a minor constituent or is absent; with greater than 10% quartz the rock is termed a quartz monzonite.
  3. Batholiths are almost always made mostly of felsic or intermediate rock-types, such as granite, quartz monzonite, or diorite (see also granite dome).


  1. Associated minerals are chert, quartz, Fe-silicates, Fe-carbonates, chlorite, amphibole, biotite, feldspar, and chalcopyrite.
  2. The pebbles include quartz, quartzite, quartz sandstone, pale pink mudstone and chert, embedded in a matrix of sand.
  3. Chert is the general term applied to the granular cryptocrystalline varieties of quartz, of which flint and Jasper are examples.

Silicon Dioxide

  1. Silicon is usually found in the form of silicon dioxide (also known as quartz), and other more complex silicate minerals.
  2. The crust is primarily quartz (silicon dioxide) and other silicates like feldspar.
  3. Quartz, as silicon dioxide, crystallizes in the form of masses, grains, druses, and prismatic hexagonal crystals.


  1. The pale pink color of quartz, which can range from transparent to translucent, is known as rose quartz.
  2. Chalcedony - A transparent or translucent and finely crystalline variety of quartz.
  3. This type of quartz is mainly transparent to translucent, with a vitreous luster.

Milky Quartz

  1. Quartz - both blue quartz (See Appendix A.), milky quartz and heat-treated amethyst have been so-used.
  2. The six minerals: milky quartz, sulfur, talc, magnetite, actinolite, mica.
  3. Rose quartz is rare on the dumps, clear smoky and milky quartz being much more common.

Petrified Wood

  1. Petrified wood is a type of fossil, in which the tissues of a dead plant are replaced with minerals (most often a silicate, such as quartz).
  2. The process is similar to that which takes place when quartz replaces wood to produce petrified wood.

Quartz Crystal

  1. Cairngorm is a variety of quartz crystal found in the Cairngorm Mountains of Scotland.
  2. Amber, bloodstone, calcite, magnetite, malachite, opal, quartz crystal and ruby.
  3. QUARTZ CRYSTAL ~ FADEN: This crystal facilitates the attunement between the self and another, similar to the action produced by the Herkimer diamond.

Common Minerals

  1. Some common minerals are feldspar, quartz, calcite, mica, and hornblend.
  2. Quartz, feldspar and biotite are the most common minerals found in rhyolite.
  3. In addition to a variety of common minerals, such as quartz, feldspars, and epidote, hornfels locally contain unique phases.

Potassium Feldspar

  1. In granite, sodium plagioclase and biotite typically form first, followed by muscovite, potassium feldspar, and last of all quartz.
  2. Quartz is associated most commonly with Aegirine and Potassium Feldspar, as well as Zircon.
  3. Granite is a felsic rock, meaning it is rich in potassium feldspar and quartz.


  1. Gangue minerals are mainly dolomite, breunnerite, and ankerite in association with quartz, calcite, dickite, fuchite, and talc.
  2. Limestone - Rock composed of at least 50% calcium carbonate, containing impurities such as Quartz, Dolomite, clay, and iron oxides.
  3. Quartz, calcite and dolomite are the most common such minerals.


  1. GANGUE MINERALOGY [Principal and subordinate]: Calcite, dolomite, siderite, ferroan calcite, ankerite, hematite, biotite, titanite, olivine, quartz.
  2. Common mineral matter includes quartz, kaolinite (clay), calcite, siderite and pyrite.
  3. Boulangerite minerals are commonly associated with several interesting minerals that include galena, pyrite, arsenopyrite, siderite, quartz and sphalerite.


  1. Associated Minerals include anatase, rutile, quartz, feldspars, chalcopyrite, hematite and sphene.
  2. Associated Minerals are quartz, rutile, kyanite, andalusite, garnets, muscovite, corundum, wardite, brazilianite and siderite.
  3. Associated minerals in eclogites include garnet, quartz or coesite, rutile, kyanite, phengite, and lawsonite.

Rutilated Quartz

  1. Quartz gems also include rutilated quartz, citrine, ametrine, onyx, and chrysoprase.
  2. Some of the more important varieties of included quartz for gem use are rutilated quartz and tourmalinated quartz.
  3. RUTILATED QUARTZ: Magnifies the energies of QUARTZ and aids in healing and releases troubled thoughts and feelings.


  1. Gilford area: anorthite, augite, corundum, clinozoisite, goethite, hastingsite, ilmenite, magnetite (lodestone), nepheline, quartz (amethyst).
  2. Also occurs with augite, magnetite, pyrite, apatite and quartz.
  3. Sunapee area: beryl, biotite, fluorapatite, garnet, graphite, magnetite, quartz (crystals, rose, rutilated).


  1. Minor mneral contents may include apatite, biotite, hematite, hornblende, ilmenite, magnetite, and quartz.
  2. Minerals: calcite, dolomite, quartz, gypsum, anhydrite, halite, sylvite, hematite, magnetite.
  3. Chalk is composed of between 50 and 98 percent calcium carbonate and various of minerals including clay, hematite, mica, quartz and pyrite.


  1. This chemical property is reflected in the mode of the mafic members that have two pyroxenes, hypersthene and augite [Ca(Mg, Fe)Si2O6], and perhaps quartz.
  2. Basic igneous rocks are characterized by the absence of quartz and the predominance of dark minerals such as ferromagnesian minerals (amphiboles, pyroxenes).


  1. Smaller amounts of quartz or minerals rich in iron and magnesium such as olivine, pyroxene, biotite, or hornblende are also present.
  2. Some important rock-forming silicates include the feldspar s, quartz, olivine s, pyroxene s, amphibole s, garnet s, and mica s.
  3. Quartz monzonite - feldspars (K-feldspars = plagioclases), less quartz, biotite, hornblende, pyroxene.


  1. Chlorites are most often known to mineral collectors as inclusions in or coatings on quartz, danburite, topaz, calcite and many other minerals.
  2. Lodolite is a variety of quartz with inclusions of chlorite, iron and calcite.
  3. Aventurine quartz is a type of quartz that has sparkling flecks (inclusions) of mica or iron.


  1. A type of Quartz that heads a family which includes Agate, Carnelian, Jasper, Tiger's Eye, and Onyx.
  2. Agate is a variety of chalcedony formed from layers of quartz which usually show varicolored bands.
  3. Agate is the most common variety of chalcedony which is a form of quartz.


  1. Diabase forms from a magma that is rich in iron and magnesium, and poor in silica (quartz).
  2. Sandstone - A sedimentary rock consisting of grains of sand, usually quartz, cemented by some substance such as silica, iron oxide, calcite, etc.
  3. Sandstone, as the name suggests, is mainly made up of grains of quartz (sand) bound together by a cement (usually clay or silica).


  1. The majority of petrified wood is hydrous microcrystalline varieties of quartz, termed as chalcedony or opal.
  2. It often occurs in amorphous or fine-grained minerals such as flint, opal or obsidian, but may also occur in crystalline minerals such as quartz.
  3. Some examples of semiprecious stones are amethyst, aventurine, carnelian, garnet, opal, peridot, rose quartz, etc.


  1. Lepidolite is often found associated with other minerals, such as spodumene, quartz, amblygonite, feldspar, and tourmaline.
  2. Other minerals that may be found in association with muscovite include feldspar, quartz, beryl, and tourmaline.
  3. This pegmatite contains crystals of quartz, feldspar, muscovite and tourmaline.


  1. Associated minerals include quartz, feldspar, spodumene, amblygonite, tourmaline, columbite, cassiterite, topaz, and beryl.
  2. Associated Minerals include quartz, orthoclase, sapphire, chrysoberyl, ruby, topaz, zircon, spinel and other gemstones found in placer deposits.
  3. Moh's scale of hardness: 1) talc 2) gypsum 3) calcite 4)flourite 5) apatite 6) orthoclase 7) quartz 8) topaz 9) corundum 10) diamond.


  1. Gangue minerals are quartz, K-feldspar, biotite, calcite, and white mica.
  2. Gangue minerals are quartz, muscovite, K-feldspar, fluorite, lepidolite, and rare tourmaline.
  3. Granodiorite feldspars (plagioclase more than K-feldspar), quartz, a little dark mica biotite (e.g.


  1. Main constituents of these gneisses are plagioclase, biotite, hornblende, quartz and in places cummingtonite and microcline.
  2. Li-mica pegmatite contains Ta-Nb minerals, cassiterite, Li-mica, quartz, albite, microcline, apatite, tourmaline, topaz, beryl, and other minerals.
  3. It occurs with quartz, microcline, and muscovite in pegmatites, and with quartz, muscovite, and almandine in schist of regional metamorphic rocks.

Plagioclase Feldspars

  1. Associated Minerals are quartz, plagioclase feldspars, micas, garnets, tourmalines and topaz.
  2. Associated Minerals are quartz, muscovite and plagioclase feldspars.
  3. Amphibolite is a gouping of rocks composed mainly of amphibole (as hornblende) and plagioclase feldspars, with little or no quartz.

Plagioclase Feldspar

  1. Plutonic rocks are primarily comprised of 5 minerals: quartz, potassium feldspar, plagioclase feldspar, biotite, and hornblende.
  2. This pile contains plagioclase feldspar, potassium feldspar, quartz, muscovite mica, biotite mica, amphibole, olivine, and calcite.
  3. A relatively dense rock, gabbro is primarily composed of pyroxene and plagioclase feldspar, but olivine, amphibole, and quartz may also be present.

Gangue Minerals

  1. Gangue minerals are mainly quartz and lesser ankerite, calcite, dolomite, siderite, donbassite, sericite, and gypsum.
  2. Gangue minerals are quartz, siderite, chalcedony, kaolin, calcite, barite, and fluorite.
  3. Gangue minerals are kaolinite, quartz, marcasite, pyrite, calcite, arsenopyrite and fluorite.


  1. Gangue minerals are barite, quartz, carbonate, albite, sericite, chlorite, and rare fluorite.
  2. Gangue minerals are quartz, tourmaline, sericite, and chlorite, and rare muscovite and feldspar.
  3. Gangue minerals are mainly quartz and lesser feldspar, sericite, chlorite, epidote, and others.

Alkali Feldspar

  1. In these rocks it is commonly found in association with alkali feldspar, quartz, and sometimes biotite, garnet, andalusite, sillimanite, or kyanite.
  2. Abbreviations are QZ for quartz, KF for alkali feldspar, PL for plagioclase, Hbld for hornblende, Opx for orthopyroxene, and Cpx for clinopyroxene.
  3. Dacites and rhyolites commonly have phenocrysts of plagioclase, alkali feldspar (usually sanidine), and quartz in a glassy matrix.


  1. Aegirine, albite, biotite, calcite, cancrinite, fluorite, hastingsite, nepheline, quartz, sodalite.
  2. Associated Minerals include lepidolite, beryl, quartz, albite, triphylite, amblygonite, spodumene and various manganese oxides.
  3. Associated Minerals include many rare minerals as well as nepheline, feldspars especially albite, and natrolite, quartz, calcite and aegirine.


  1. Agate: A variety of chalcedony quartz that is a very common and used often in jewelry.
  2. Agate is a type of chalcedony quartz that forms by filling a cavity in a rock.
  3. Agate Geode Agate is a form of chalcedony quartz that forms in concentric layers in a remarkable variety of colors and textures.


  1. Wall rock alteration consists of quartz, dolomite, ankerite, serpentine, chlorite, sericite, talc, and kaolinite.
  2. Accessory minerals are quartz, tourmaline, muscovite, sericite, chlorite, feldspar, carbonate minerals, and fluorite.
  3. Enclosures of other minerals (rutile, chlorite, haematite, gothite, actinolite, asbestos and many others) are extremely frequent in crystals of quartz.


  1. At granulite facies the deposit consists of magnetite, quartz, hypersthene, diopside, amphibole, ilmenite, plagioclase, garnet, and biotite.
  2. They concluded that biotite, chlorite and amphibole contributed to the determined NP, whereas quartz, muscovite, plagioclase and K-feldspar did not.
  3. The final assemblage we can establish in these rocks is biotite + andalusite + K-feldspar + plagioclase + ilmenite + quartz (Assemblage 3).


  1. The essential components of aplites are quartz and alkali feldspar (the latter usually orthoclase or micro perthite), microcline and albite.
  2. Associated with the ordinary minerals of granite pegmatite, orthoclase, albite, quartz and muscovite; also with lepidolite, beryl, apatite, fluorite, ete.
  3. Common felsic minerals include quartz, biotite, muscovite, hornblende, orthoclase, and the sodium rich plagioclase feldspars.

Rock Crystal

  1. Pure quartz, traditionally called rock crystal (sometimes called clear quartz), is colorless and transparent (clear) or translucent.
  2. Cairngormstone () A yellow or smoky brown variety of rock crystal, or crystallized quartz, found esp, in the mountain of Cairngorm, in Scotland.
  3. Macrocrystalline quartz includes rock crystal, amethyst, citrine, smoky quartz, rose quartz and tiger's eye.


  1. Ametrine Ametrine is a form of quartz which occurs in bands of yellow and purple, a combination of the colors of amethyst and citrine.
  2. AMETRINE is a quartz which shares the colors and qualities of amethyst and citrine, being part violet and part golden.
  3. Natural citrine is rare compared to amethyst or smoky -- quartz --, both of which are often heated to turn their natural color into that of citrine.


  1. Typical minerals of pelitic assemblages include quartz, muscovite, biotite, andalusite, sillimanite, cordierite, plagioclase, microcline, and staurolite.
  2. Its occurrence is associated with quartz, microcline, albite, muscovite, lepidolite, tourmaline and beryl.
  3. They are olivine, pyroxene, amphibole, orthoclase, plagioclase, muscovite, biotite, and quartz.


  1. Diorite - plagioclase, biotite, hornblende and pyroxene, small amount of K-feldspar and quartz.
  2. Subordinate phenocrysts include clinopyroxene, biotite, ilmenite, magnetite, sanidine, hornblende, quartz, and orthopyroxene.
  3. Quartz diorite - plagioclase, quartz, biotite, and hornblende, small amount of K-feldspar (e.g.


  1. Encyclopedia of Keywords > Nature > Natural Resources > Minerals
  2. Nature > Matter > Solids > Crystals
  3. Granite
  4. Variety
  5. Nature > Matter > Materials > Rocks

Related Keywords

    * Abundant * Abundant Quartz * Amethyst * Associated Minerals * Biotite * Brown * Calcite * Crystal * Crystals * Epidote * Feldspar * Feldspars * Fluorite * Form * Forms * Glass * Gold * Grains * Granite * Granites * Mica * Micas * Mineral * Minerals * Pink * Pyrite * Quartz Crystals * Quartz Grains * Quartz Sand * Quartz Veins * Rock * Rocks * Rose Quartz * Sand * Smoky Quartz * Stone * Stones * Varieties * Variety * Veins * Yellow
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