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'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.

This breathtaking, colorsplash of a rare opal-type gemstone is found in the US. As with amber & pearl, it is a biogenic gemstone, and given gemstone status in 1981.

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).

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!

from Mail Online

Photographer captures rare 'fire rainbow cloud' above Florida as Mother Nature puts on spectacular light show

Photographer captures rare 'fire rainbow cloud' above Florida as Mother Nature puts on spectacular light show Ken Rotberg spotted unusual phenomenon as sun dropped behind a storm cloud in the early evening Rare sight also known as a 'circumhorizon arc'