This diaspore crystal is from Selcuk in the Mugla Province, Aegean Region, Turkey. Large crystals of gem diaspore were first found as a component mineral in the commercial bauxite mines in the area. It is in the oxide;hydroxide group of minerals and it contains the elements Al, H, and O. It varies in color depending on the trace elements in the crystal matrix. The Jewelry trade sells it under the names csarite, ottomanite and zultanite and all are false. This is a transparent crystal with a glass luster and it a pale yellow color. The base ( as displayed in photo 5) and the rear of the crystal have have oxide deposits. Both ends of the crystal have natural terminations. Tourmaline It measures 1 9/16 x 1/2 x 3/16 inches or 40 x 12 x 5 mm.