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- Quartz and oxides
These specimens are labeled as polychrome corundum as sapphire and ruby. They show a dual range of tones, between red to blue and purple, depending on the incident light and even within the same crystal. They have a very good quality and brilliance that makes them stand out from other of the same species. On some faces we can observe geometric striated lines. They are disposed on a matrix of brilliant mica (muscovite-biotite). Fluorescence UVA.
Madagascar
Amboarohy, Zazafotsy, Fianarantsoa Province
5,1x4,5x3,6 cm
93.8g
