Machaerium scleroxylon   Color: Dark violet brown with dark streaks.   Tree: Mid-sized, rarely large.   Wood Description: Fine to medium texture. Sometimes sold as a substitute for Brazilian Rosewood or named ''Bolivian Rosewood'' and ''Santos Rosewood.'' Hard, but works well. Gorgeous. Dust may be an irritant to some people.   Typical Uses: Furniture, cabinets, flooring, turning, accessories.   Growth Region: Tropical South America, primarily southern Brazil and Bolivia.