This tourmaline crystal, variety dravite, is from Mwajanga, Simadjiro District, Manyara Provice, Tanzania. Dravite is a boron silcate in the tourmaline series of minerals. It contains the elements Na, Mg, Al, Si, B, O and H. It can be found in a variety of colors ranging from blue to brown. This crystal has a light yellow-green color. It is transparent with a vitreous luster. It is double terminated and measures 30 x 7 x 5 mm.