2016-10-17
Topaz

a-test a-test

Topaz is a silicate mineral of aluminium and fluorine.
The name "topaz" is usually derived from the Greek Τοπάζιος (Τοpáziοs), the ancient name of St. John's Island in the Red Sea which was difficult to find and from which a yellow stone was mined in ancient times. Alternatively, the word topaz may be related to the Sanskrit word तपस् "tapas", meaning "heat" or "fire".
Pure topaz is colorless and transparent but is usually tinted by impurities; typical topaz is wine red, yellow, pale gray, reddish-orange, or blue brown. It can also be white, pale green, blue, gold, pink (rare), reddish-yellow or opaque to transparent/translucent.
Orange topaz, also known as precious topaz, is the traditional November birthstone, the symbol of friendship.
Imperial topaz is yellow, pink (rare, if natural) or pink-orange. Brazilian Imperial Topaz can often have a bright yellow to deep golden brown hue, sometimes even violet. Many brown or pale topazes are treated to make them bright yellow, gold, pink or violet colored. 
Some clear topaz crystals from Brazilian pegmatites can reach boulder size and weigh hundreds of pounds. The American Golden Topaz weighed a massive 22,892.5 carats.
http://golpera.com/product/1023

 

Comments: