Turquoise can be found in many colors,
including deep blue, light blue,
greenish-blue shades, green, and even
yellow. What accounts for this
The presence of copper in the rock where
turquoise forms will result in blue
shades. This is the shade of blue
that is most prized and that is denoted
when "turquoise" is used as a color.
If a high concentration of iron is
present, then the turquoise will take on
a green shade. This is due to some iron
replacing aluminium in the mineral.
When zinc is present, the
turquoise will take on a yellow-green
shade. This is a rare color, found
only in a few mines.