The dependence of emeralds and chromaquamarines colours on chemical elements

Abstract

Beryls, that are found in Zambia, Tanzania and Australia, are characterized by particularly beautiful greenish blue hues with a bright pleochroism. These minerals contain a small amount of chromium and vanadium, however, they are relatively rich in iron which determines a bluish colour and provides pleochroism. The author distinguished a new variety that is called chromaquamarine. Chromium or vanadium impart a green colour in emerald, divalent iron imparts a light blue colour for aquamarine and all three pre­viously mentioned chemical elements impart a bluish colour with a greenish hue for chromaquamarine.