The 4 types of green quartz:

  1. Natural green quartz from the Montezuma mine
  2. Heat-treated amethyst
  3. Gamma irradiated quartz
  4. Synthetic green quartz

Dr. Henn discussed heating iron-bearing amethyst quartz 400 - 500 C to produce green, followed by gamma irradiation, then heat again to produce a blue violet shade, which he also referred to as blueberry quartz. The colour is attributed to NBO centers (dangling bonds).

Though in his example the starting material was treated amethyst resulting from gamma irradiated colourless or pale yellow material, the starting material could also make use of natural green quartz from the Montezuma mine in Brazil.

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