Black tourmaline (schorl)

ETYMOLOGY: Turmali comes from the english term, meaning approximately "Stone of various colors."

CRYSTAL SYSTEM: Trigonal.

PRINCIPLE OF FORMATION: Primary.

CLASS MINERAL: Ciclosilicatos.

CHEMICAL FORMULA, MINERAL ELEMENTS: NaFe3 (Al, Fe) 6 [(OH, F) 4 (BO3) 2Si6O18].
 
HARDNESS: 7 - 7.5 on the Mohs scale.

FIELDS: Brazil, Afghanistan, Australia, Burma, India, Madagascar, Zimbabwe, Tanzania, Sri Lanka, Nepal, Zaire, Namibia.

 
 

MINERALOGY: The tourmaline originates primarily in plutonitas acids, specifically pegmatite, where forms large crystals. Through the action of gases containing boron, from the magma of the host rock, tourmaline it can also arise as inclusion neumatolítica (generated depth of the crust (Plutonism) by intrusion of magma, which causes alteration in petrographic composition of the invaded rock) then the crystals are included strongly on the rock, tourmaline is constituted by various mineral elements, but always has the same structure, the metals are always included in tourmaline and are causing varieties colors of this mineral.


MYTHOLOGY: The tourmaline is the only gem that has all the shades of transparent black, for more than 2300 years ago this stone and struck the philosopher Teofrasto whom called "lyngurion" probably a tourmaline, and had the property of attracting straw, ash or small pieces of wood when it was heated, showing its pyroelectric properties, this means that both ends opposite charges accumulate as much when heated under pressure. The tourmalines were introduced in Western and Central Europe in 1703 by the Dutch who imported it from Ceylon.


PROPERTIES: It is said that tourmaline protects against radiation from mobile phones, electromagnetic mist, the negative energy of others, increases vitality and reduces stress clearing negative thoughts, black tourmaline promotes a relaxed and objective attitude processes clear and rational thoughts, it promotes a positive attitude, whatever the circumstances, improves sleep, brings clarity, logic and rationality.
 

CHAKRAS: Sacral.

ZODIAC SIGN: Capricorn.

USES: Jewellery, meditation, collection, for its piezoelectric properties have industrial applications such as the manufacture of pressure gauges, especially in submarine warfare equipment and instrumentation. This gem was used in the pressure sensor of the first atomic bomb. Brightly colored varieties were made in ancient times used to manufacture polarizers known as "tourmaline tongs".

 
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