Further below is the official description of Osmium, but I would like to point out:
Except for radionuclides with short half lives, Osmium is
1 the rarest element.
2 the densest element - closely followed by Iridium.
Osmium has a blue-gray tint and is the densest stable element, slightly denser than iridium. Calculations of density from the X-ray diffraction data may produce the most reliable data for these elements, giving a value of 22.562±0.009 g/cm3 for iridium versus 22.587±0.009 g/cm3 for osmium.
Osmium is a hard but brittle metal that remains lustrous even at high temperatures. It has a very low compressibility. Correspondingly, its bulk modulus is extremely high, reported between 395 and 462 GPa, which rivals that of diamond(443 GPa). The hardness of osmium is moderately high at 4 GPa. Because of its hardness, brittleness, lowvapor pressure (the lowest of the platinum group metals), and very high melting point (the fourth highest of all elements), solid osmium is difficult to machine, form, or work.In 2012, the estimated US production of osmium was 75 kg. As a powder it is somewhat reactive producing toxic Osmium Tetroxide, but these ingots are completely safe - even odourless! Please note you are buying one 5 gram pellet.
This is an excellent price!
Buy it NOW!