All about topaz, one of the most mysterious stones. It is also the stone of the month of November ♦
It is the stone of the month of November (with citrine), but the topaz is also one of the gems coveted since antiquity. There is, however, a point against him: if it is blue shade is often confused with other stones less valuable, as aquamarine and apatite. Other times, the topaz is mistaken for smoky quartz or citrine. Care must be taken, therefore, because often a simple quartz is sold as topaz. And to say that the topaz can be just as precious as diamonds or sapphires.
The name. It’s called topaz for centuries. But what does the name? According to some, the term dates back to a small island in the Red Sea, Topazos. Here the Romans, according to this version, extracted the stones called, precisely, Topazos. Too bad, in real world they are not on topaz on island, but the stones are now classified as peridot. So much so that the island nowadays has changed its name: it is called Zabargad, which in Arabic means just peridot. The misunderstanding, however, is not solved. So? Another version traces the name topaz to Sanskrit, the classical language of ancient India. In Sanskrit, the word topas means fire. The mystery continues.
Composition. The topaz is from a geological point of view a silicate mineral of aluminum and fluorine. It is crystallized in prism shape, ending in pyramidal faces. Chemically, the aluminum silicate is highly similar in structure to the zircon. In theory, the topaz is a mineral allocromatico, that is pure is colorless. In fact, it is often found with traces of chromium, manganese or iron. These elements are those that stain the topaz, turning red, pink, blue-green, blue (natural), pink-orange, yellow-brown, yellow-orange (cherry), yellow, colorless.
Where is it. The topaz brown, yellow, orange, cherry, red and pink, are located in Brazil and Sri Lanka. The pink topaz found in Pakistan and Russia. It is a mineral rich enough (there is even one that weighs 300 kilograms), an aspect that keeps a relatively low price.
Characteristics. Sometimes the topaz has inclusions equivalents: according to experts, in some blue topaz you can have even the impression of a sort of floating. Attention: the color of the natural stone tends to fade in the sunlight. For this reason, a lot of topaz are treated. In some cases they are heated up to about 450 degrees celsius. In this case the topaz brown-orange get pink. Or become colorless. Another system is the radiation. Exposed to radiation from cobalt 60, topazes that are colorless or pale color, acquire a deeper shade. Experts assure that this treatment with radiation is not dangerous.