What is Boulder Turquoise?
also known as Ribbon Turquoise, is
characterized by beautiful ribbons or veins of turquoise meandering through its
host (boulder) rock.
Polished Boulder Turquoise reflects, on a micro level, the
intricate way turquoise is formed in nature. These ribbons or veins of turquoise form in
the crevices and cracks of the host rock where minerals such as aluminum,
copper & iron settle. It is actually
these contaminating minerals that give turquoise its beautiful varied
color. Where there is a predominance of
copper mineral, then turquoise develops with more of a blue hue. When iron finds more of its way into the
sediment then green turquoise hues are formed. Imagine extrapolating these beautiful boulder turquoise
stones to a macro level and visualize a cross-section of a mountain where the
crevices are filled with mineral sediment.
Then, give it a bit of time and over millions of years, nature gifts us
with beautiful ribbons (veins) of turquoise.
Turquoise cutters do exactly this. They preserve the vein of turquoise by cutting
a cross-section of the boulder in which the turquoise ribbon is formed and then
polish the face. This way you can
appreciate the entire developmental process and wear a bit of the mountain.
So, Boulder Turquoise is a descriptive name that reflects
the formation process of turquoise.
Boulder or Ribbon Turquoise may originate from various turquoise mines,
however, the Boulder Turquoise you will see often comes from Nevada turquoise
mines and commonly Royston and Pilot Mountain turquoise mines.