What is Tanzanite?
Tanzanite is a blue and violet variety of the mineral zoisite and is only found in Tanzania, in a very small mining area near the Merelani Hills. Tanzanite is a relatively new gemstone, having been discovered in 1967, and has gained immense popularity due to its rarity and stunning hue.
Tanzanite is a vibrant blue-violet gemstone that belongs to the zoisite family. Its unique color and rarity make it a popular choice for jewelry, especially rings and earrings.
|Chemical Classification||Inorganic - Silicate (Zoisite)|
|Color||Tanzanite displays a range of colors from deep blue to vibrant violet. It can also exhibit pleochroism, showing different colors when viewed from different angles.|
|Occurrence||Tanzania (specifically the Merelani Hills).|
|Formation||Tanzanite forms in metamorphic rocks, particularly in the presence of high amounts of vanadium.|
|Mohs Hardness||6.5 to 7.|
|Diagnostic Properties||Blue to violet, a variety of zoisite.|
|Pleochroism||Distinct; tanzanite can display different colors (typically blue, violet, and burgundy) depending on the viewing angle.|
|Crystal System||Orthorhombic (variety of Zoisite)|
|Optical Properties||Biaxial (+)|
|Refractive Index||1.691 - 1.700|
|Birefringence||0.006 - 0.013|
|2V angle||Measured: 58° to 63°|