This is the polished on the both sides colorless tourmaline slice. Dimensions: 2.1 x 1.8 x 0.2″ (5.4 x 4.6 x 0.6cm). Weight – 151.5ct (30.3 grams). Origin: Russia, Transbaikalia.
Some information about tourmaline:
In 1703, Dutch sailors first brought into Europe elongated crystals of purple-pink color. Following the inhabitants of Ceylon, they called these rocks «turemali» that are meaning is mineral, jewel. Thus arose the modern term tourmaline, which is called a variety of silicate, which includes compounds of aluminum, boron, manganese and magnesium.
Tourmaline stone features a large variety of colors. Ruby-red stones are called rubellite, purple-red stones found in the Urals – siberite. Verdelite is green tourmaline, indigolite – blue. Yellowish-brown stones on the deposit Drava in Austria was called dravite. Rare colorless crystals called ahroite. A very common black variety of tourmaline calls schorl.
Tourmaline deposits exist on the territory of Burma, Sri Lanka, in Madagascar, India, Ceylon, Afghanistan, Greenland, Germany, Norway and the USA. The largest crystals mined in Brasil in 1978, in this country was found tourmaline 1 meter long. In Africa tourmalines are found in Zimbabwe, Mozambique, Tanzania and Kenya. In Russia, tourmaline deposits are found in Transbaikalia.