TOPAZ
The Topaz is a silicate d'aluminium. It is constituted of aluminium, silicium and oxygen, but also fluor and ion oxhydryle ( group formed of a atom of oxygen and atom of hydrogen.
His hardness is 8
Déposits the richest are located in Brazil, particularly in the Minas Gerais, and the regions of Téofilo Otoni. It there exist also in Pakistan, Russia (l'Oural) Mexico, Sri Lanka, Madagascar and Nigeria. For information Topaz intense blue is obtained by bombardment gamma rays on the crystals, often used for imitate the Aquamarine.
Classic view
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