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Cosa (chi) è quartz crystal - definizione
Quartz crystal microbalance
MEASUREMENT OF THE CHANGE IN FREQUENCY OF A QUARTZ CRYSTAL RESONATOR
Piezoelectric microbalance; Quartz Crystal Microbalances; Piezoelectric microbalances; Sauerbrey thickness; Sauerbrey mass; Quartz microbalance; Quartz crystal nanobalance; Quartz crystal microbalance techniques
A quartz crystal microbalance (QCM) (also known as quartz microbalance (QMB), sometimes also as quartz crystal nanobalance (QCN)) measures a mass variation per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film deposition at the surface of the acoustic resonator.
Conite
![Granite rock in the cliff of Gros la Tête on [[Aride Island]], [[Seychelles]]. The thin (1–3 cm wide) brighter layers are quartz veins, formed during the late stages of crystallization of granitic magmas. They are sometimes called "hydrothermal veins".](https://commons.wikimedia.org/wiki/Special:FilePath/ArideGranite1.jpg?width=200 "Granite rock in the cliff of Gros la Tête on [[Aride Island]], [[Seychelles]]. The thin (1–3 cm wide) brighter layers are quartz veins, formed during the late stages of crystallization of granitic magmas. They are sometimes called \"hydrothermal veins\".")
![hydrothermal method]], about 19 cm long and weighing about 127 grams](https://commons.wikimedia.org/wiki/Special:FilePath/Quartz synthese.jpg?width=200 "hydrothermal method]], about 19 cm long and weighing about 127 grams")
![transparency]]](https://commons.wikimedia.org/wiki/Special:FilePath/Transparency.jpg?width=200 "transparency]]")
![Synthetic quartz crystals produced in the autoclave shown in [[Western Electric]]'s pilot hydrothermal quartz plant in 1959](https://commons.wikimedia.org/wiki/Special:FilePath/Prototype synthetic quartz autoclave 1959.jpg?width=200 "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, c. 1000.](https://commons.wikimedia.org/wiki/Special:FilePath/Ewer birds Louvre MR333.jpg?width=200 "Fatimid]] ewer in carved rock crystal (clear quartz) with gold lid, c. 1000.")
MINERAL MADE OF SILICON AND OXYGEN
Citrine (mineral); Rose quartz; Rock crystal; Milk quartz; Milky quartz; Quartz (mineral); Citrines; Quartz crystal; Conite; Blue quartz; Blue Quartz; Citrine quartz; Citrine topaz; Star Blue Quartz; Quarz; Fruit quartz; Asdivite; Quartz sand; Quartz crystals; Rock-crystal; Milky Quartz; Bristol stone; Bristowe stone; Star blue quartz; Rose Quartz; Anacona ruby; Citrine gemstone; Synthetic quartz
·noun A magnesian variety of dolomite.
quartz
MINERAL MADE OF SILICON AND OXYGEN
Citrine (mineral); Rose quartz; Rock crystal; Milk quartz; Milky quartz; Quartz (mineral); Citrines; Quartz crystal; Conite; Blue quartz; Blue Quartz; Citrine quartz; Citrine topaz; Star Blue Quartz; Quarz; Fruit quartz; Asdivite; Quartz sand; Quartz crystals; Rock-crystal; Milky Quartz; Bristol stone; Bristowe stone; Star blue quartz; Rose Quartz; Anacona ruby; Citrine gemstone; Synthetic quartz
n.
Silex, silica.
Esempi dal corpus di testo per quartz crystal
1. This was astonishing given that pure, rock quartz crystal is only slightly softer than diamond and therefore incredibly difficult to carve.
2. But if a silicon crystal chip in a computer can store gigabytes of memory, then why shouldn‘t a piece of raw quartz crystal contain secrets of its own?
3. What most surprised them, however, was that our ‘primitive‘ ancestors had made the skull from exactly the type of quartz crystal that is a key component in computers today.
4. Since quartz crystal does not corrode, decay or otherwise change with time, it is impossible to date, but their tests showed that the object had been carved from one solid block of crystal.