... ceramic spinel (Transparent Magnesium Aluminate spinel, MgAl2O4 transparent spinel, MA polycrystalline spinel) is a Transparent Ceramic spinelIntrodctionTransparent ceramic spinel (Transparent Magnesium Aluminate spinel, MgAl2O4 transparent spinel, MA polycrystalline spinel) is ... Tanzania, and Tadzhikistan, part of the former Soviet Union.Spinel is a durable gemstone that is perfect for all jewellery ...