Natural Gemstones: Reference Facts
Blue Green Tourmaline
Blue Green Tourmaline is one of the most popular and desirable gemstones. This variety of tourmaline is available from bluish green to blue-green or green-blue. Some stones exhibit beautiful color and brilliance so similar to those of Paraiba tourmaline, the rarest and most expensive tourmaline found in Brazil in the state of Paraiba, that only an experienced specialist can notice the differences. Due to the rarity and beauty of its color and crystal, blue green tourmaline is a favorite of gemstone lovers and collectors. The beautiful and glowing color of blue green tourmaline provides unlimited inspiration, and is sure to give the wearer and the owner a great deal of pleasure. In addition, with the hardness of 7.5 on the Mohs' scale, blue green tourmaline has excellent wearing quality and is very durable and valuable.
Like all varieties of tourmaline, blue green tourmaline is believed to strengthen the body and spirit, and protect the wearer against dangers and misfortune. Blue green tourmaline is also thought to bring happiness to life and help in relieving stress.
| Blue Green Tourmaline Known Facts
|
| Color |
Bluish Green, Blue-Green
|
| Clarity
|
Type I – usually eye clean and very high clarity under magnification
|
| Crystal Structure
|
Trigonal
|
| Chemical Composition
|
Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 - Complex borosilicate
|
| Luster
|
Vitreous
|
| Optic Character
|
Doubly Refractive
|
| Durability
|
Very Good
|
| Specific Gravity(SG)
|
3.06
|
| Refractive Index(RI)
|
1.62-1.64
|
| Birefringence
|
0.018
|
| Hardness
|
7.5
|
| Occurrence
|
Brazil, Afghanistan, Pakistan, Mozambique, Madagascar, Nigeria, the United States |
|
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