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Tourmaline-Gemstones

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Group: Tourmaline
Hardness: 7-7,5
Specific Gravity: 3-3,20
Crystal System: trigonal
IIndex of Refraction: 1,630-1,700
Transparency: transparent


The composition of Tourmaline is a blend of different chemical elements with a predominance of aluminum, iron, il manganese, and magnesium. The colors of Tourmaline vary greatly. As a consequence, a range of varietal names is available for the different colors: Achroite for the colorless variety, Rubellite (the finest quality) for deep red, Indicolite for blue, Dravite for brown, Elbaite and Verdelite for green, and Shorl for black. The most important sources are located in Brazil, Sri Lanka, India, and Madagascar

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