Discovered in 1907 by G. Urbain in Paris, France, and, independently, by C. James at the University of New Hampshire, USA. Lutetium is the hardest, densest and one of the rarest of the lanthanide group of elements (it has an abundance of 0.51 ppm in the earth's crust). It is found in some of the less common minerals (e.g. gadolinite and xenotime) and is difficult to isolate. Applications of lutetium tend to be limited to research only.Powder - Small particles with an approximately defined size range. Those materials described as alloy precursors are not true alloys - they are made by sintering a blend of powders of the component metals to achieve alloying by diffusion. The resultant cake is ground and sieved to the required particle size range. Unless otherwise stated, the particle sizes shown are for guidance only. We do not guarantee either any particular size distribution between the quoted minimum and maximum sizes, or a specific particle shape.