Tourmaline

The name of the gem tourmaline comes from the Sinhalese word "tourmali", which means "attracting ash" - the so-called stone, delivered from Ceylon to Amsterdam in the early 18th century. The stone does have this property after heating, which allowed it to be used to clean the smoking pipes.

The name of the gem tourmaline comes from the Sinhalese word tourmali, which means attracting ash - the so-called stone, delivered from Ceylon to Amsterdam in the early 18th century

Tourmaline (the size of the crystal is about 5 cm across, Pamir).

Tourmaline is a transparent stone with a variety of colors (this parameter is superior to all others precious stones), complex aluminum silicate, boron, magnesium, iron, sodium with an admixture of lithium, manganese in composition and structure. Glitter is glassy, cleavage is absent, brittle, hardness 7, 5-8. The shape of the crystals is elongated, columnar, in the cross section often in the form of a spherical triangle. Crystals tourmaline is small, but sometimes it can reach 40 cm in length. Occurs in pegmatite veins, granites, metamorphic rocks - schists.

Transparency and a variety of colors have caused the use of tourmaline in various jewelry, and the stones are cut into a variety of shapes. The color can be red, pink, green, dark-blue, bluish-green, black, tan, brownish-black. Tourmaline can be colorless. There are also crystals with two, three colors and even five-color. In Brazil, for example, there are crystals with a red core, bordered first with light, and then with dark green and green zones. South African tourmaline have a green core surrounded by a red outer zone. A wide variety of colors depends on the chemical composition.

Green tourmaline from Brazil is called zeixite. Black is also called a sherlock or an africite. Colorless is called achroit, pink - rubellite (or apyrite), dark blue - indigolite, brownish black - dravit (or scraped). Very interesting is the chameleonite - tourmaline, which has olive green in the afternoon, and in the evening, under artificial lighting, a brownish-red color. Most jewelry tourmalines are chemical in composition to elbait (pink, red, pale green tourmaline). One of the varieties of it - liddiokoit - has a blue, brown, pink or green color.

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