Prepd by direct fusing of the elements: Ditte, Compt. Rend. 95, 641 (1882); 96, 1792 (1883); 97, 44 (1883); Berzelius cited in Mellor's vol. X, 784 (1930); by adding powdered selenium to molten, anhydr stannous chloride: Schneider, Pogg. Ann. 127, 624 (1866).