"Fire Rainbows" are the rarest of all naturally occurring atmospheric phenomena. For a fire rainbow to occur, cirrus clouds must be 20,000 feet in the air with the precise amount of ice crystals, and the sun must hit the clouds at 58 degrees
Blue Tiger Eye sphere
opal encloses sunset..
Fordita ou como é mais conhecida Ágata de Detroit
Cuprite, a copper mineral that was not known until 1845, is a secondary mineral of oxidizing sulfide-rich copper deposits. It's symmetry is in the Isometric system, but this specimen looks to have unequal axes of symmetry. This slightly more than one inch crystal is from Bisbee, Arizona.
Fractal branching patterns in nature, Dendritic Agate Cabochon