Zoisite Visible Spectra (400 - 1000 nm)

The blue variety, tanzanite, is colored by vanadium. It is highly pleochroic before it is heat-treated for the commercial gem market. Pink zoisite contains Mn3+. Green varieties contain Fe3+.

  Images of the zoisite absorption spectrum



      Heated Tanzanite

    Pink Zoisite

    Green Zoisite

    Pale Yellow Zoisite

    Irradiated Zoisite

    Manganese-containing Zoisite - the variety thulite 

Link to references about the spectra of zoisite

last  updated: 20-Dec-2014