The Morogoro area in Tanzania is the source of many gemstones, and most notably spinel, ruby, sapphire and tourmaline. For many years fine quality chrome tourmaline were mined in this and other areas in Tanzania, and during past decade substantial quantities have been produced of fine quality rough tourmaline in earth tone colors, ranging from reddish orange to brown to yellow and green. These highly dichroic gems, show different colors and/or different intensities when observed from different angles, and they were the subject of our color analysis and research.
