'Fire rainbows' are a rare phenomenon that only occur when the Sun is higher than 58° above the horizon and its light passes through cirrus clouds made of ice crystals. At the right alignment, the ice crystals act as a prism, and refract the light to look like a rainbow.
Fire Rainbow Ken Rotberg/WPTV Otherwise known as iridescent clouds, "fire rainbows" are a result of uniformly water-filled clouds diffracting light. Photographer Ken Rotberg took this great example of one above Delray Beach, Florida on Tuesday.
This is a rare meteorological phenomenon called a skypunch. When people see these, they think it’s the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover. Freakishly weird!
Osmium twinning / Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family & is the densest naturally occurring element, with a density of (slightly greater than that of iridium & twice that of lead).