Global Gemstone Certification
Turquoise
Turquoise
An ancient gemstone, it is popular on an international level. It is typically stabilized and this process improves durability while providing a deeper hue of color. When turquoise is green, it’s quite common for the color to be improved by using aniline.
|
Chemical Formula |
CuAl6(PO4)4(OH)8 • 4H2O |
|
Color |
Blue, Green, Multicolored |
|
Hardness |
5 – 6 |
|
Crystal System |
Triclinic |
|
Refractive Index |
1.61 – 1.65 |
|
SG |
2.6 – 2.8 |
|
Transparency |
Opaque |
|
Double Refraction |
.04 |
|
Luster |
Waxy |
|
Cleavage |
None |
|
Mineral Class |
Turquoise |