Sunday, 7 April 2019

Indigo tourmaline

Though tourmaline occurs in many colors, blue is the rarest. The blue tourmaline that has attracted attention lately is the rare paraiba. But all blue tourmaline is rare, even the non-copper-bearing. Indicolite tourmaline, colored by iron, can vary from a light to a deep blue. Like most tourmaline, it is strongly pleochroic.

Also called indicolite, Indigo Tourmaline is one of the rarest and most desirable varieties of tourmaline. The name Indigo is now also used for tourmaline that reflects the fusion of green and blue that is seawater.

Brazil has always been the principal source of tourmaline of all colors. It is also found in Afghanistan and Pakistan.