Name | Quartz |
---|---|
Category | Silicate mineral |
Boxwidth | 24 |
Caption | Quartz crystal cluster from Tibet |
Formula | Silica (silicon dioxide, SiO2) |
Strunz | 04.DA.05 |
Dana | 75.01.03.01 |
Symmetry | Trigonal H–M Symbol 32 |
Unit cell | a = 4.9133 Å, c = 5.4053 Å; Z=3 |
Color | Colorless through various colors to black |
Habit | 6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive |
System | α-quartz: trigonal trapezohedral class 3 2; β-quartz: hexagonal 622 |
Lattice | hexagonal |
Twinning | Common Dauphine law, Brazil law and Japan law |
Cleavage | {0110} Indistinct |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs | 7 – lower in impure varieties (defining mineral) |
Luster | Vitreous – waxy to dull when massive |
Refractive | nω = 1.543–1.545 nε = 1.552–1.554 |
Opticalprop | Uniaxial (+) |
Birefringence | +0.009 (B-G interval) |
Pleochroism | None |
Streak | White |
Gravity | 2.65; variable 2.59–2.63 in impure varieties |
Melt | 1670 °C (β tridymite) 1713 °C (β cristobalite) |
Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
There are many different varieties of quartz, several of which are semi-precious gemstones. Especially in Europe and the Middle East, varieties of quartz have been since antiquity the most commonly used minerals in the making of jewelry and hardstone carvings.
The word "quartz" is derived from the German word "quarz" and its Middle High German ancestor "twarc", which probably originated in Slavic (cf. Czech tvrdý ("hard"), Polish twardy ("hard")).
Quartz belongs to the trigonal crystal system. The ideal crystal shape is a six-sided prism terminating with six-sided pyramids at each end. In nature quartz crystals are often twinned, 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. Well-formed crystals typically form in a 'bed' that has unconstrained growth into a void, but because the crystals must be attached at the other end to a matrix, only one termination pyramid is present. A quartz geode is such a situation where the void is approximately spherical in shape, lined with a bed of crystals pointing inward.
α-quartz crystallizes in the trigonal crystal system, space group P3121 and P3221 respectively. β-quartz belongs to the hexagonal system, space group P6221 and P6421, respectively. These spacegroups 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 change in the way they are linked.
Citrine is one of three traditional birthstones for the month of November.
In crystal form (rarely found) it is called pink quartz and its color 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, USA, but most crystals on the market come from Minas Gerais, Brazil.
Rose quartz is not popular as a gem – it is generally too clouded by impurities to be suitable for that purpose. Rose quartz is more often carved into figures such as people or hearts. Hearts are commonly found because rose quartz is pink and an affordable mineral.
Due to natural quartz being so often twinned, much of the quartz used in industry is synthesized. Large, flawless and untwinned crystals are produced in an autoclave via the hydrothermal process; emeralds are also synthesized in this fashion. While these are still commonly referred to as quartz, the correct term for this material is silicon dioxide.
Quartz occurs in hydrothermal veins as gangue along with ore minerals. Large crystals of quartz are found in pegmatites. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.
Naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, are expensive and rare. A major mining location for high purity quartz is the Spruce Pine Gem Mine in Spruce Pine, North Carolina, United States.
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 the Republic of Ireland. The Irish word for quartz is grian cloch, which means 'stone of the sun'. 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.
Roman naturalist Pliny the Elder believed quartz to be water ice, permanently frozen after great lengths of time. (The word "crystal" comes from the Greek word κρύσταλλος, "ice".) He supported this idea by saying that quartz is found near glaciers in the Alps, but not on volcanic mountains, and that large quartz crystals were fashioned into spheres to cool the hands. He also knew of the ability of quartz to split light into a spectrum. 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 no matter how distorted a quartz crystal, the long prism faces always made a perfect 60° angle.
Charles B. Sawyer invented the commercial quartz crystal manufacturing process in Cleveland, Ohio, United States. This initiated the transition from mined and cut quartz for electrical appliances to manufactured quartz.
Quartz's piezoelectric properties were discovered by Jacques and Pierre Curie in 1880. The quartz oscillator or resonator was first developed by Walter Guyton Cady in 1921. George Washington Pierce designed and patented quartz crystal oscillators in 1923. Warren Marrison created the first quartz oscillator clock based on the work of Cady and Pierce in 1927.
Category:Quartz varieties Category:Piezoelectric materials Category:Dielectrics Category:German loanwords Category:Symbols of Georgia (U.S. state) Category:Trigonal minerals
This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
Name | Hans Zimmer |
---|---|
Landscape | yes |
Background | non_performing_personnel |
Birth name | Hans Florian Zimmer |
Born | September 12, 1957 |
Origin | Frankfurt, Germany |
Instrument | Piano, keyboard, guitar |
Genre | Film score |
Occupation | Film composer |
Years active | 1977–present |
Label | Remote Control Productions |
Url | http://www.hans-zimmer.com |
Hans Florian Zimmer (born September 12, 1957) is a German film score composer and music producer. For nearly three decades he has composed music for over 100 films including some critically acclaimed film scores, such as The Lion King, Gladiator, and The Dark Knight. Some of his recent works are Frost/Nixon (2008), Angels & Demons (2009), Sherlock Holmes (2009), Inception (2010), and Megamind (2010).
Zimmer spent the early part of his career in the United Kingdom before moving to the United States. He is the head of the film music division at DreamWorks studios, and works with other composers through the company which he founded, Remote Control Productions.
His works are notable for integrating electronic music sounds with traditional orchestral arrangements. He has received four Grammy Awards, two Golden Globes, a Classical BRIT Award, and an Academy Award. Zimmer is also ranked Number 72 on the list of the "Top 100 living geniuses", published by The Daily Telegraph.
A year after Rain Man, Zimmer was asked to compose the score for Bruce Beresford's Driving Miss Daisy which, like Rain Man, won an Academy Award for Best Picture. Driving Miss Daisy’s instrumentation consisted entirely of synthesizers and samplers, played by Zimmer. According to an interview with Sound On Sound magazine in 2002, the piano sounds heard within the score come from the Roland MKS–20, a rackmount synthesizer. Zimmer joked: "It didn't sound anything like a piano, but it behaved like a piano."
1991's Thelma & Louise soundtrack by Zimmer featured the trademark slide guitar performance by Pete Haycock on the "Thunderbird" theme in the film. As a teenager, Zimmer was a fan of Haycock, and their collaboration on film scores includes K2 and Drop Zone.
For the 1992 film The Power of One, Zimmer traveled to Africa in order to use African choirs and drums in the recording of the score. On the strength of this work, Disney Animation Studios approached Zimmer to compose the score for the 1994 film The Lion King. This was to be his first score for an animated film. Zimmer said that he had wanted to go to South Africa to record parts of the soundtrack, but was unable to visit the country as he had a police record there "for doing 'subversive' movies" after his work on The Power of One. Disney studio bosses expressed fears that Zimmer would be killed if he went to South Africa, so the recording of the choirs was organized during a visit by Lebo M. Zimmer won numerous awards for his work on The Lion King, including an Academy Award for Best Music (Original Score), a Golden Globe, and two Grammys. In 1997, the score was adapted into a Broadway musical version which won the Tony Award for Best Musical in 1998.
Zimmer's score for Crimson Tide (1995) won a Grammy Award for the main theme, which makes heavy use of synthesizers in place of traditional orchestral instruments. For The Thin Red Line (1998), Zimmer said that the director Terrence Malick wanted the music before he started filming, so he recorded six and a half hours of music. Bruckheimer wanted Zimmer to rescore the film, but due to his commitments on The Last Samurai, the task of composing and supervising music for Pirates of the Caribbean: The Curse of the Black Pearl was given to Klaus Badelt, one of Zimmer's colleagues at Media Ventures. Zimmer provided some themes that were used in the film, although he is not credited on screen. Zimmer was hired as the composer for the two subsequent films in the series, Pirates of the Caribbean: Dead Man’s Chest (2006) and (2007).
Zimmer is also noted for his work on the scores of Christopher Nolan's Batman Begins (2005) and The Dark Knight (2008), on which he collaborated with James Newton Howard. Zimmer succeeded in reversing the decision not to nominate The Dark Knight in December 2008, arguing that the process of creating a modern film score was collaborative, and that it was important to credit a range of people who had played a part in its production. Zimmer explained his approach to scoring with other musicians in an interview with Soundtrack.net in 2006:
"Originally I had this idea that it should be possible to create some kind of community around this kind of work, and I think by muddying the titles - not having "you are the composer, you are the arranger, you are the orchestrator" - it just sort of helped us to work more collaboratively. It wasn't that important to me that I had "score by Hans Zimmer" and took sole credit on these things. It's like Gladiator: I gave Lisa Gerrard the co-credit because, even though she didn't write the main theme, her presence and contributions were very influential. She was more than just a soloist, and this is why I have such a problem with specific credits."
Zimmer works with other composers through his company Remote Control Productions, formerly known as Media Ventures. His studio in Santa Monica, California has an extensive range of computer equipment and keyboards, allowing demo versions of film scores to be created quickly. His colleagues at the studio have included Steve Jablonsky, James Dooley, Geoff Zanelli, Henning Lohner, Harry Gregson-Williams, Mark Mancina, John Van Tongeren, John Powell and Thomas J.Bergersen.
In October 2000, Zimmer performed live in concert for the first time with an orchestra and choir at the 27th Annual Flanders International Film Festival in Ghent. He has received a range of honors and awards, including the Lifetime Achievement Award in film Composition from the National Board of Review, the Frederick Loewe Award in 2003 at the Palm Springs International Film Festival, ASCAP’s Henry Mancini Award for Lifetime Achievement, and BMI's Richard Kirk Award for lifetime achievement in 1996. Recent work includes the Spanish language film Casi Divas Sherlock Holmes and The Burning Plain (2009). He composed the theme for the television boxing series The Contender, and worked with Lorne Balfe on the music for , which was his first video game project.
In December 2010, Zimmer received a star on the Hollywood Walk of Fame. He dedicated the award to his publicist and long term friend Ronni Chasen, who was shot dead in Beverly Hills the previous month.
Zimmer lives in Los Angeles with his wife Suzanne, and has four children.
Category:Best Original Music Score Academy Award winners Category:Grammy Award winners Category:German film score composers Category:German composers Category:People from Frankfurt Category:1957 births Category:Living people *1
This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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