Glass Beach is a beach park in MacKerricher, near Fort Bragg, California, USA. What draws attention is the sand on this beach with multi colored glass pebbles. The beach park is a preserved, often visited by tourists. The pebbles can't be removed. 02
Osmium twinning / Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family and is the densest naturally occurring element, with a density of 22.59 g/cm3 (slightly greater than that of iridium and twice that of lead).