Scheelite

Color due to neodymium. The intense broad band in the yellow dominates the spectrum as is often the case with lab created stones doped with neodymium. When the darker ray is polarized the three lines centered at 525nm. are of equal intensity.

The intense broad band in the yellow dominates the spectrum as is often the case with lab created stones doped with neodymium. As the spectrum of this lighter ray is isolated by a polarizing filter, note the three lines in the green centered at about 525 nm. in which the one on the long wave side is fainter than the other two.

Spectrum due to neodymium. The main feature in this spectrum is the group of seven lines in the yellow area between 575nm. and 595nm. which is typical of neodymium content. In some specimens two other groups may be seen, one in the green and one in the blue, but these are fewer in number, weaker, and more difficult to detect.

Spectrum due to neodymium. The main feature in this spectrum is the group of seven lines in the yellow area between 575nm. and 595nm. which is typical of neodymium content. All the lines in the group in the yellow are seen in equal intensity without any dominant lines. In some specimens two other groups may be seen, one in the green and one in the blue, but these are fewer in number, weaker, and more difficult to detect.