The densest stable element is Osmium, which is slightly denser than iridium and about twice as dense as lead. It has a blue-gray hue. The most accurate density estimates for these elements may come from X-ray diffraction calculations, which yield a value of 22.5870.009 g/cm3 for osmium and 22.5620.009 g/cm3 for iridium. Both metals are approximately 23 times as dense as water and 1+16 times as dense as gold.
Osmium single crystals have a complex and strongly direction-dependent reflectivity. Light in the red and near-infrared spectrum is more strongly absorbed when polarised parallel to the c crystal axis than when polarised perpendicular to the c axis; c-parallel polarisation is also slightly more reflective in the mid-ultraviolet spectrum. Reflectivity sharply decreases for the c-parallel polarisation at 1.5 eV (near-infrared) and 2.0 eV (orange), respectively, and peaks for both in the visible spectrum at about 3.0 eV. (blue-violet).
Read More- https://coherentmarketinsightsus.blogspot.com/2023/02/osmium-has-wide-range-of-uses-from.html
