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Qu'est-ce (qui) est Tourmaline - définition
CYCLOSILICATE MINERAL SUPERGROUP
Schorl; Tourmalines; Shorl; Dravite; Rossmanite; Olenite; Feruvite; Tormaline
Tourmaline
A mineral; a subsilicate; characterized by the presence of boric
trioxide, which replaces aluminum oxide. It is notable for possessing
pyro-electric properties. (See Pyro-electricity.)
tourmaline
['t??m?l?n, -li:n]
¦ noun a brittle grey or black mineral consisting of a boron aluminosilicate, with piezoelectric and polarizing properties.
Origin
C18: from Fr., based on Sinhalese toramalli 'carnelian'.
Tourmaline
·noun A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels.
Wikipédia
Tourmaline
Tourmaline ( TOOR-mə-lin, -leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is a gemstone and can be found in a wide variety of colors.
The name is derived from the Sinhalese tōramalli (ටෝරමල්ලි), which refers to the carnelian gemstones.
Exemples du corpus de texte pour Tourmaline
1. Afghanistan jewellery includes Lapis Lazuli, Tourmaline and Ruby.
2. Scientists also found indications of abundant deposits of colored stones and gemstones, including emerald, ruby, sapphire, garnet, lapis, kunzite, spinel, tourmaline and peridot.
3. Gifts included a "triangular photo frame with clock 18 carat yellow gold, mother of pearl, tourmaline and enamel," worth more than $100,000.
4. Compressed crystals that generate power Piezoelectricity was discovered in 1880 by Pierre and Paul–Jacques Curie, who found that compressing certain types of crystals – including quartz, tourmaline, and Rochelle salt – along certain axes produced a voltage that could be measured on the crystal‘s surface.The next year, they observed that applying an electric current could make the crystals elongate very slightly.