Agate Chrysocolla Hematite Moissanite Pearl Tanzanite Brilliance Fluorescence
Alexandrite Chrysoprase Iolite Moonstone Pyrite Tigerís Eye Carat Hardness Inc
Amber Citrine Ivory Mother Pearl Quartz Topaz Clarity Stability
Amethyst Coral Jade Mystic Topaz Rubies Tourmaline Color Inclusion
Ametrine Diamond Jasper Obsidian Sapphire Turquoise Cut Toughness
Aquamarine Emerald Kunzite Onyx Spinel Yellow Topaz Durability
Blue Topaz Feldspar Malachite Opal Star Sapphire Zircon Facet
Cats Eye Garnet Marcasite Peridot Sugilite  
 

Blue Topaz - The Different Sizes and Shapes

Blue Topaz is a form of Topaz with a blue color center. Topaz is generally colorless and found in moderate quantities all over the world, it is an aluminum fluorosilicate. While Blue Topaz is perhaps the most popular type of Topaz, Topaz does come in a wide range of colors. Topaz can be found in colors such as yellow, brown and brownish green. Topaz can also come in Imperial Topaz colors. Imperial Topaz colors include the colors pink, orange, violet and the rarest of all red.

Topaz contains aluminum and silicon among other elements, most notably iron. It is said that iron and other trace elements is what creates these remarkable colors. The reason for Topaz’s beautiful colors is the color center, these centers are not fully understood, but radiation either by heat or sunlight can affect the color of the Topaz. For instance, if you take a colorless piece of Topaz and heat it, it can in certain instances turn blue and 99.9% of commercially sold Blue Topaz has been irradiated.

Blue Topaz is a glassy, transparent or translucent gemstone. It is generally very hard earning an 8 on the Moh’s hardness scales, however because of its near perfect cleavage, it can fracture extremely easily. It is important if you wear Topaz often, to be very gentle with it and protect it from hard impacts. Topaz can be cut into almost any shape and size. While the largest piece of Topaz every found, was from Brazil weighing over 6 kilograms, most Topaz found are only a few carats in size.

How and where is Blue Topaz formed and found

Topaz is a mineral that is an aluminum fluorosilicate, this means that it contains aluminum, silicon and traces of other elements including iron. Topaz comes in a variety of colors, but is mostly clear. However colors such as blue, green, yellow and brown are popular. There are also rarer types of Topaz called Imperial Topaz, they consist of colors such as orange, pink, violet and the rarest of all red.

Topaz gets its colors via color centers inside the mineral. A color center is an area in the mineral that can contain different elements, but usually iron, oxygen and hydrogen. While there is much that is still not known about these color centers, it is known that radiation such as heat and light can affect the color of the Topaz. For instance, 99.9% of Blue Topaz on the market has been irradiated to give it its brilliance. While Blue Topaz is very stable, in some instances heating it or leaving it in sunlight can deplete the color center.

Topaz is found in many parts of the world usually in silica rocks such as granite. It usually forms and crystallizes in granite pegmatites during lava flows. It has been found in large quantities in Russia, in the Ural Mountains, Germany, the Czech Republic, Brazil, Mexico and even in the United States.

Blue Topaz is very hard with a hardness of 8 on the Moh’s scale, but although it is extremely hard the cleavage is much too perfect causing the stone to fracture on any type of hard impact.

Continue reading about Blue Topaz
 
   
   
 
 
 
© 2007 Gemstone Education