TURQUOISE


All facts and figures taken from the GIA

TURQUOISE

Azure sky, robin’s egg blue: Vivid shades of turquoise define the color that’s named after this gem. Turquoise is found in only a few places on earth: dry and barren regions where acidic, copper-rich groundwater seeps downward and reacts with minerals that contain phosphorus and aluminum. The result of this sedimentary process is a porous, semitranslucent to opaque compound of hydrated copper and aluminum phosphate.


MINERAL: Turquoise
CHEMISTRY: CuAl6(PO4)4 (OH)8.5H2O
COLOR: Blue to green
REFRACTIVE INDEX: 1.610 to 1.650
BIREFRINGENCE: Not detectable
SPECIFIC GRAVITY: 2.76 (+0.14, -0.36)
MOHS HARDNESS: 5 to 6


Turquoise is associated with being the birthstone for the month of December.

FOUND WHERE

Precious_Gemstone_Where_Found_Turquoise