Quartz

Quartz is a hard mineral composed of silica (silicon dioxide). Its atoms are linked in a continuous framework of SiO₄ silicon–oxygen tetrahedra, with each oxygen atom being shared between two tetrahedra, giving an overall chemical formula of SiO₂. Therefore, quartz is classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most common mineral or mineral group in Earth's lithosphere, comprising about 12% by mass.

Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at Template:Convert. Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold.

There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia.

Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion.

Etymology

The word quartz is derived from the German word , which had the same form in the first half of the 14th century in Middle High German and in East Central German and which came from the Polish dialect term kwardy, which corresponds to the Czech term ("hard"). Some sources, however, attribute the word's origin to the Saxon word Querkluftertz, meaning cross-vein ore.

The Ancient Greeks referred to quartz as (Template:Transliteration) meaning "crystal", derived from the Ancient Greek (Template:Transliteration) meaning "icy cold", because some philosophers (including Theophrastus) believed the mineral to be a form of supercooled ice. Today, the term rock crystal is sometimes used as an alternative name for transparent, coarsely crystalline quartz.Template:Rp

Early studies

Roman naturalist Pliny the Elder believed quartz to be ice, permanently frozen after great lengths of time. He supported this idea by saying that quartz is found near glaciers in the Alps, but in warm climates. This idea persisted until at least the 17th century.

In the 17th century, Nicolas Steno's study of quartz paved the way for modern crystallography. He discovered that regardless of a quartz crystal's size or shape, its long prism faces always joined at a perfect 60° angle, thus discovering the law of constancy of interfacial angles.

Crystal habit and structure

Template:Multiple image Quartz belongs to the trigonal crystal system at room temperature and to the hexagonal crystal system above Template:Convert. The former is called α-quartz; the latter is β-quartz. The ideal crystal shape is a six-sided prism terminating with six-sided pyramid-like rhombohedrons at each end. In nature, quartz crystals are often twinned (with twin right-handed and left-handed quartz crystals), distorted, or so intergrown with adjacent crystals of quartz or other minerals as to only show part of this shape, or to lack obvious crystal faces altogether and appear massive.Template:R

Well-formed crystals typically form as a druse (a layer of crystals lining a void), of which quartz geodes are particularly fine examples. The crystals are attached at one end to the enclosing rock, and only one termination pyramid is present. However, doubly terminated crystals do occur where they develop freely without attachment, for instance, within gypsum.

α-quartz crystallizes in the trigonal crystal system, space group P3₁21 or P3₂21 (space group 152 or 154 resp.) depending on the chirality. Above Template:Convert, α-quartz in P3₁21 becomes the more symmetric hexagonal P6₄22 (space group 181), and α-quartz in P3₂21 goes to space group P6₂22 (no. 180).

These space groups are truly chiral (they each belong to the 11 enantiomorphous pairs). Both α-quartz and β-quartz are examples of chiral crystal structures composed of achiral building blocks (SiO₄ tetrahedra in the present case). The transformation between α- and β-quartz only involves a comparatively minor rotation of the tetrahedra with respect to one another, without a change in the way they are linked.Template:R However, there is a significant change in volume during this transition, and this can result in significant microfracturing in ceramics during firing, in ornamental stone after a fire and in rocks of the Earth's crust exposed to high temperatures, thereby damaging materials containing quartz and degrading their physical and mechanical properties.

• Common, prismatic quartz
  Common, prismatic quartz
• Sceptered quartz
  Sceptered quartz
• Sceptered quartz (as aggregates: "Elestial quartz")
  Sceptered quartz (as aggregates: "Elestial quartz")
• Bipyramidal quartz
  Bipyramidal quartz
• Tessin or tapered quartz
  Tessin or tapered quartz
• Twinned quartz (known as Japan law)
  Twinned quartz (known as Japan law)
• Dauphine quartz (single dominant face)
  Dauphine quartz (single dominant face)
• "Herkimer diamond"
  "Herkimer diamond"
• Druse quartz
  Druse quartz
• Granular quartz
  Granular quartz
• Massive quartz
  Massive quartz

Varieties (according to microstructure)

Although many of the varietal names historically arose from the color of the mineral, current scientific naming schemes refer primarily to the microstructure of the mineral. Color is a secondary identifier for the cryptocrystalline minerals, although it is a primary identifier for the macrocrystalline varieties.

The most important microstructure difference between types of quartz is that of macrocrystalline quartz (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification). The cryptocrystalline varieties are either translucent or mostly opaque, while the macrocrystalline varieties tend to be more transparent. Chalcedony is a cryptocrystalline form of silica consisting of fine intergrowths of both quartz, and its monoclinic polymorph moganite. Agate is a variety of chalcedony that is fibrous and distinctly banded with either concentric or horizontal bands. While most agates are translucent, onyx is a variety of agate that is more opaque, featuring monochromatic bands that are typically black and white. Carnelian or sard is a red-orange, translucent variety of chalcedony. Jasper is an opaque chert or impure chalcedony.

Varieties of quartz

Type	Color and description	Transparency	Microstructure
Rock crystal	Colorless	Transparent	Macrocrystalline
Amethyst	Purple to violet colored quartz	Transparent	Macrocrystalline
Citrine	Yellow quartz ranging to reddish-orange or brown (Madeira citrine), and occasionally greenish yellow	Transparent	Macrocrystalline
Rose quartz	Pink, may display diasterism	Transparent	Macrocrystalline
Chalcedony	Fibrous, occurs in many varieties. The term is often used for white, cloudy, or lightly colored material intergrown with moganite. Otherwise more specific names are used.	Translucent to opaque	Cryptocrystalline
Carnelian	Reddish orange chalcedony	Translucent	Cryptocrystalline
Aventurine	Quartz with tiny aligned inclusions (usually mica) that shimmer with aventurescence	Translucent to opaque	Macrocrystalline
Agate	Multi-colored, concentric or horizontal banded chalcedony	Semi-translucent to translucent	Cryptocrystalline
Onyx	Typically black-and-white-banded or monochromatic agate	Semi-translucent to opaque	Cryptocrystalline
Jasper	Impure chalcedony or chert, typically red to brown but the name is often used for other colors	Opaque	Cryptocrystalline or Microcrystalline
Milky quartz	White, may display diasterism	Translucent to opaque	Macrocrystalline
Smoky quartz	Light to dark gray, sometimes with a brownish hue	Translucent to opaque	Macrocrystalline
Tiger's eye	Fibrous gold, red-brown or bluish colored chalcedony, exhibiting chatoyancy.	Opaque	Cryptocrystalline
Prasiolite	Green	Transparent	Macrocrystalline
Rutilated quartz	Contains acicular (needle-like) inclusions of rutile	Transparent to translucent	Macrocrystalline
Dumortierite quartz	Contains large amounts of blue dumortierite crystals	Translucent	Macrocrystalline

Varieties (according to color)

File:Transparency.jpg

Quartz crystal demonstrating transparency

Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. These color differentiations arise from the presence of impurities which change the molecular orbitals, causing some electronic transitions to take place in the visible spectrum causing colors.

Amethyst

Amethyst is a form of quartz that ranges from a bright vivid violet to a dark or dull lavender shade. The world's largest deposits of amethysts can be found in Brazil, Mexico, Uruguay, Russia, France, Namibia, and Morocco. Amethyst derives its color from traces of iron in its structure.

Ametrine

Ametrine, as its name suggests, is commonly believed to be a combination of citrine and amethyst in the same crystal; however, this may not be technically correct. Like amethyst, the yellow quartz component of ametrine is colored by iron oxide inclusions. Some, but not all, sources define citrine solely as quartz with its color originating from aluminum-based color centers. Other sources do not make this distinction. In the former case, the yellow quartz in ametrine is not considered true citrine. Regardless, most ametrine on the market is in fact partially heat- or radiation-treated amethyst.

Blue quartz

Blue quartz contains inclusions of fibrous magnesio-riebeckite or crocidolite.

Dumortierite quartz

Inclusions of the mineral dumortierite within quartz pieces often result in silky-appearing splotches with a blue hue. Shades of purple or gray sometimes also are present. "Dumortierite quartz" (sometimes called "blue quartz") will sometimes feature contrasting light and dark color zones across the material. "Blue quartz" is a minor gemstone.

Citrine

Citrine is a transparent, yellow variety of quartz. The cause of its color is not well agreed upon. Evidence suggests the color of citrine is linked to the presence of aluminum-based color centers in its crystal structure, similar to those of smoky quartz. Alternatively, it has been suggested that the color of citrine may be due to trace amounts of iron.

Natural citrine is rare; most commercial citrine is heat-treated amethyst or smoky quartz. Heat-treated amethyst is often a darker yellow or even brown, and consequently it is sometimes called "burnt amethyst". Unlike natural citrine, the color of heat-treated amethyst comes from trace amounts of the iron oxide minerals hematite and goethite. Clear quartz with natural iron inclusions or limonite staining may also be mistaken for citrine. Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul.

Milky quartz

Milk quartz or milky quartz is the most common variety of crystalline quartz. The white color is caused by minute fluid inclusions of gas, liquid, or both, trapped during crystal formation, making it less valuable for optical and quality gemstone applications.

Rose quartz

Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. The color is usually considered as due to trace amounts of titanium, iron, or manganese in the material. Some rose quartz contains microscopic rutile needles that produce asterism in transmitted light. Recent X-ray diffraction studies suggest that the color is due to thin microscopic fibers of possibly dumortierite within the quartz.

Additionally, there is a rare type of pink quartz (also frequently called crystalline rose quartz) with color that is thought to be caused by trace amounts of phosphate or aluminium. The color in crystals is apparently photosensitive and subject to fading. The first crystals were found in a pegmatite found near Rumford, Maine, US, and in Minas Gerais, Brazil. The crystals found are more transparent and euhedral, due to the impurities of phosphate and aluminium that formed crystalline rose quartz, unlike the iron and microscopic dumortierite fibers that formed rose quartz.

Smoky quartz

Smoky quartz is a gray, translucent version of quartz. It ranges in clarity from almost complete transparency to a brownish-gray crystal that is almost opaque. Some can also be black. The translucency results from natural irradiation acting on minute traces of aluminum in the crystal structure.

Prase

Prase is a leek-green variety of quartz that gets its color from inclusions of the amphibole actinolite. However, the term has also variously been used for a type of quartzite, a microcrystalline variety of quartz or jasper, or any leek-green quartz.

Prasiolite

Prasiolite, also known as vermarine, is a variety of quartz that is green in color. The green is caused by iron ions. It is a rare variety in nature and is typically found with amethyst; most "prasiolite" is not natural – it has been artificially produced by heating of amethyst. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, but it is also seen in Lower Silesia in Poland. Naturally occurring prasiolite is also found in the Thunder Bay area of Canada.

Piezoelectricity

Quartz crystals have piezoelectric properties; they develop an electric potential upon the application of mechanical stress. Quartz's piezoelectric properties were discovered by Jacques and Pierre Curie in 1880.

Occurrence

File:Quartz vein in sandstone (Thunderhead Sandstone, Neoproterozoic; Clingmans Dome, Great Smoky Mountains, North Carolina, USA) 2 (36619574200).jpg

Quartz vein in sandstone, North Carolina

Quartz is the second most abundant mineral or mineral group in the Earth's lithosphere; by mass, the feldspar group comprises 41% of the lithosphere, followed by quartz at 12% and the pyroxene group at 11%. Quartz is a defining constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale. It is a common constituent of schist, gneiss, quartzite and other metamorphic rocks. Quartz has the lowest potential for weathering in the Goldich dissolution series and consequently it is very common as a residual mineral in stream sediments and residual soils. Generally a high presence of quartz suggests a "mature" rock, since it indicates the rock has been heavily reworked and quartz was the primary mineral that endured heavy weathering.

While the majority of quartz crystallizes from molten magma, quartz also chemically precipitates from hot hydrothermal veins as gangue, sometimes with ore minerals such as gold, silver and copper. Large crystals of quartz are found in magmatic pegmatites. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.

The largest documented single crystal of quartz was found near Itapore, Goiaz, Brazil; it measured approximately Template:Convert and weighed over Template:Cvt.

Mining

Quartz is extracted from open pit mines. Miners occasionally use explosives to expose deep pockets of quartz. More frequently, bulldozers and backhoes are used to remove soil and clay and expose quartz veins, which are then worked using hand tools. Care must be taken to avoid sudden temperature changes that may damage the crystals.

Related silica minerals

File:P-T Diagram for SiO2.svg

Pressure-temperature diagram showing the stability ranges for the two forms of quartz and some other forms of silica

Tridymite and cristobalite are high-temperature polymorphs of SiO₂ that occur in high-silica volcanic rocks. Coesite is a denser polymorph of SiO₂ found in some meteorite impact sites and in metamorphic rocks formed at pressures greater than those typical of the Earth's crust. Stishovite is a yet denser and higher-pressure polymorph of SiO₂ found in some meteorite impact sites.Template:R Moganite is a monoclinic polymorph. Lechatelierite is an amorphous silica glass SiO₂ which is formed by lightning strikes in quartz sand.

Safety

As quartz is a form of silica, it is a possible cause for concern in various workplaces. Cutting, grinding, chipping, sanding, drilling, and polishing natural and manufactured stone products can release hazardous levels of very small, crystalline silica dust particles into the air that workers breathe. Crystalline silica of respirable size is a recognized human carcinogen and may lead to other diseases of the lungs such as silicosis and pulmonary fibrosis.

Synthetic and artificial treatments

A long, thin quartz crystal

A synthetic quartz crystal grown by the hydrothermal method, about Template:Convert long and weighing about Template:Convert

Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility to such treatments depends on the location from which the quartz was mined.

Prasiolite, an olive colored material, is produced by heat treatment; natural prasiolite has also been observed in Lower Silesia in Poland. Although citrine occurs naturally, the majority is the result of heat-treating amethyst or smoky quartz. Carnelian has been heat-treated to deepen its color since prehistoric times.

Because natural quartz is often twinned, synthetic quartz is produced for use in industry. Large, flawless, single crystals are synthesized in an autoclave via the hydrothermal process.

Like other crystals, quartz may be coated with metal vapors to give it an attractive sheen.

Uses

Quartz is the most common material identified as the mystical substance maban in Australian Aboriginal mythology. It is found regularly in passage tomb cemeteries in Europe in a burial context, such as Newgrange or Carrowmore in Ireland. Quartz was also used in Prehistoric Ireland, as well as many other countries, for stone tools; both vein quartz and rock crystal were knapped as part of the lithic technology of the prehistoric peoples.

While jade has been since earliest times the most prized semi-precious stone for carving in East Asia and Pre-Columbian America, in Europe and the Middle East the different varieties of quartz were the most commonly used for the various types of jewelry and hardstone carving, including engraved gems and cameo gems, rock crystal vases, and extravagant vessels. The tradition continued to produce objects that were very highly valued until the mid-19th century, when it largely fell from fashion except in jewelry. Cameo technique exploits the bands of color in onyx and other varieties.

Efforts to synthesize quartz began in the mid-nineteenth century as scientists attempted to create minerals under laboratory conditions that mimicked the conditions in which the minerals formed in nature: German geologist Karl Emil von Schafhäutl (1803–1890) was the first person to synthesize quartz when in 1845 he created microscopic quartz crystals in a pressure cooker. However, the quality and size of the crystals that were produced by these early efforts were poor.

Elemental impurity incorporation strongly influences the ability to process and utilize quartz. Naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing perfect large silicon boules to be sliced into silicon wafers in the semiconductor industry, are expensive and rare. These high-purity quartz are defined as containing less than 50 ppm of impurity elements. A major mining location for high purity quartz is the Spruce Pine Mining District in Spruce Pine, North Carolina, United States. Quartz may also be found in Caldoveiro Peak, in Asturias, Spain.

By the 1930s, the electronics industry had become dependent on quartz crystals. The only source of suitable crystals was Brazil; however, World War II disrupted the supplies from Brazil, so nations attempted to synthesize quartz on a commercial scale. German mineralogist Richard Nacken (1884–1971) achieved some success during the 1930s and 1940s. After the war, many laboratories attempted to grow large quartz crystals. In the United States, the U.S. Army Signal Corps contracted with Bell Laboratories and with the Brush Development Company of Cleveland, Ohio to synthesize crystals following Nacken's lead. (Prior to World War II, Brush Development produced piezoelectric crystals for record players.) By 1948, Brush Development had grown crystals that were 1.5 inches (3.8 cm) in diameter, the largest at that time. By the 1950s, hydrothermal synthesis techniques were producing synthetic quartz crystals on an industrial scale, and today virtually all the quartz crystal used in the modern electronics industry is synthetic.

An early use of the piezoelectricity of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. Also called a quartz oscillator or resonator, it was first developed by Walter Guyton Cady in 1921. George Washington Pierce designed and patented quartz crystal oscillators in 1923. The quartz clock is a familiar device using the mineral; it is simply a clock that uses a quartz oscillator as its time reference. Warren Marrison created the first quartz oscillator clock based on the work of Cady and Pierce in 1927. The resonant frequency of a quartz crystal oscillator is changed by mechanically loading it, and this principle is used for very accurate measurements of very small mass changes in the quartz crystal microbalance and in thin-film thickness monitors.

• Rock crystal jug with cut festoon decoration by Milan workshop from the second half of the 16th century, National Museum in Warsaw. The city of Milan, apart from Prague and Florence, was the main Renaissance centre for crystal cutting.[84]
  Rock crystal jug with cut festoon decoration by Milan workshop from the second half of the 16th century, National Museum in Warsaw. The city of Milan, apart from Prague and Florence, was the main Renaissance centre for crystal cutting.
• Synthetic quartz crystals produced in the autoclave shown in Western Electric's pilot hydrothermal quartz plant in 1959
  Synthetic quartz crystals produced in the autoclave shown in Western Electric's pilot hydrothermal quartz plant in 1959
• Fatimid ewer in carved rock crystal (clear quartz) with gold lid, Template:Circa
  Fatimid ewer in carved rock crystal (clear quartz) with gold lid, Template:Circa

Almost all the industrial demand for quartz crystal (used primarily in electronics) is met with synthetic quartz produced by the hydrothermal process. However, synthetic crystals are less prized for use as gemstones. The popularity of crystal healing has increased the demand for natural quartz crystals, which are now often mined in developing countries using primitive mining methods, sometimes involving child labor.

See also

• Fused quartz
• List of minerals
• Quartz fiber
• Quartz reef mining
• Quartzolite
• Shocked quartz

External links

• Quartz varieties, properties, crystal morphology. Photos and illustrations
• Gilbert Hart, "Nomenclature of Silica", American Mineralogist, Volume 12, pp. 383–395. 1927
• Terminology used to describe the characteristics of quartz crystals when used as oscillators
• Quartz use as prehistoric stone tool raw material