rock-crystal - definition. What is rock-crystal
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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]]

rock-crystal         
n.
Limpid quartz, mountain-crystal.
Rock Crystal (novella)         
NOVEL BY ADALBERT STIFTER
Bergkristall; Rock Crystal (novel)
Rock Crystal (; 1845) is a novella by Austrian writer Adalbert Stifter, about two children who become lost in a snowstorm in the Alps on Christmas Eve. It influenced Thomas Mann.
rock crystal         
¦ noun transparent quartz, typically in the form of colourless hexagonal crystals.

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 recovered items, which were found after the museum‘s director received a tip from a Tel Aviv watchmaker, include a gold and rock–crystal pocket–watch made for Marie Antoinette by the French watchmaker Abraham Louis Breguet (1747–1823) over several years.
2. Other highlights include a rock crystal ewer from 11th century Egypt and an ivory casket made in 11th century Spain, reflecting the sophistication of Islamic courts The casket‘s decoration includes scenes of refined court life, with men drinking wine and enjoying the scent of flowers while listening to music.
3. Among the items, located in August, 2006, after the museum‘s director received a telephone tip from a Tel Aviv watchmaker, the rarest and most expensive clock is a gold and rock–crystal pocket–watch made over a number of years for Marie Antoinette by the French watchmaker Abraham Louis Breguet (1747–1823). Advertisement The theft of 40 items from the original collection of 100 clocks, one of the most important in the world, occured on Friday night, April 15, 1'83, when thieves managed to bend the bars on a back window of the museum and use a ladder to get inside, covering their presence with a large truck, which they parked in the back, taking advantage of the fact that the alarm system was broken, and the guard was stationed in the front.