Picture1: Photoluminescence peaks of chromium in beryl structure. All spectra have been normalized, trimmed to 4050-4300 cm-1 and background corrected. Most of the spectra are vertically shifted in order to visualize the difference between major groups. Colored bars indicate the peak location variation in each major group.
Examples of Type I (non-schist) emeralds: China (Malipo), Colombia (Chivor, La Mina Glorieta, Las Cruces, El Diamante, El Toro, La Vega de San Juan, Coscuez and Muzo), Nigeria (Jos, Gwantu), Tanzania (Sumbawanga)
Examples of Type II (schist) emeralds: Afghanistan (Panjshir Valley), Austria (Habachtal), Brazil (Carnaiba/Sotoco, Capoeirana, Itabira, Santa Teresinha), Russia (Malishevo, Perwomaisky, Mariinsky, Aulsky, Krupsky, Chitny, Tsheremshansky), Zambia (Kafubu area), Madagaskar (Mananjary, Ankadilalana), Zimbabwe (Sandawana), South Africa (Transvaal), Spain (Franqueira), Pakistan (Mingora Mines), Mozambique (Morrua district)