|Category||beryl mineral variety|
|Color||transparent (or can be translucent if included), greenish blue to blue green, typically light in tone|
|Cleavage||very difficult in one direction, almost never seen|
|Mohs Scale hardness||7.5-8|
|Luster||vitreous to resinous|
|Refractive index||1.577 - 1.583 (+/- .017)|
|Optical Properties||Double refractive, uniaxial negative|
|Birefringence||.005 - .009|
|Pleochroism||weak to moderate, blue and greenish blue; or different tones of blue with lighter tones associated with the optic axis direction|
|Specific gravity||2.72 (+.18, -.05)|
Aquamarine (Lat. aqua marina, "water of the sea") is a gemstone-quality transparent variety of beryl, having a delicate blue or turquoise color, suggestive of the tint of seawater. It is closely related to the emerald. Colors vary—yellow beryl, called heliodor; rose pink beryl, known as morganite; and white beryl, called goshenite, are known.
This mineral occurs at most localities that yield ordinary beryl, some of the finest coming from Russia. The gem-gravel placer deposits of Sri Lanka contain aquamarine. Clear yellow beryl, such as occurs in Brazil, is sometimes called aquamarine chrysolite. When corundum presents the bluish tint of typical aquamarine, it is often called "oriental aquamarine."
In Brazil, there are mines in the states of Minas Gerais, Espírito Santo, and Bahia. Attractive aquamarine stones are also produced by Zambia, Madagascar, Malawi, Tanzania, and Kenya.
The biggest aquamarine ever mined was found at the city of Marambaia, Minas Gerais, Brazil, in 1910. It weighed over 110 kg, and its dimensions were 48.5 cm long and 42 cm in diameter.
Aquamarine is a type of beryl with a hexagonal crystal structure and a chemical formula of Be3Al2Si6O18, a beryllium aluminum silicate mineral. It has a specific gravity of 2.68 to 2.74 and a Mohs hardness from 7.5 to 8. Aquamarine, typically, is on the low end of the specific gravity range, normally at less than 2.7. The pink variety exhibits a high specific gravity of around 2.8. Refractive indices ranging around 1.57 to 1.58.
Much of today's aquamarine is heated to give it a better color blue. The deeper the blue color, the more valuable the gem is considered.
Aquamarine is also the name for a color, which is a shade between green and blue.
All links retrieved October 25, 2012.
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