quartz - definition. What is quartz
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%ما هو (من)٪ 1 - تعريف

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
  • A chiral pair of alpha quartz.
  •  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
  • transparency]]

quartz         
n.
Silex, silica.
quartz         
Quartz is a mineral in the form of a hard, shiny crystal. It is used in making electronic equipment and very accurate watches and clocks.
...a quartz crystal.
N-UNCOUNT: oft N n
Quartz         
A mineral, silica, SiO2. It has recently been used by C. V. Boys and since by others in the making of filaments for torsion suspensions. The mineral is melted, while attached to an arrow or other projectile. It is touched to another piece of quartz or some substance to which it adheres and the arrow is fired off from the bow. A very fine filament of surpassingly good qualities for galvanometer suspension filaments is produced. As a dielectric it is remarkable in possessing but one-ninth the residual capacity of glass.

ويكيبيديا

Quartz

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.

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 573 °C (846 K; 1,063 °F). 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 Eurasia.

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.

أمثلة من مجموعة نصية لـ٪ 1
1. The quartz was mixed with an equal amount of ash from desert plants rich in sodium carbonate, which lowers the melting temperature of quartz.
2. Other strategic fields include all deposits that contain diamonds, uranium, pure quartz, lithium and platinum.
3. "Now, we have moved far beyond the pendulum and the quartz–clock.
4. The contest offers three winners one EverSwiss quartz gents wristwatch per day.
5. A detonator comprising a quartz timer was placed over the explosives to trigger the explosions, sources said.