The “gem” of an ammonite dates back 71 million years, and comes with a curious coating of ammolite, giving it a dazzling rainbow iridescence. “A 'Gem' Ammonite in Matrix from the Bearpaw ...

This small, somewhat dim park under Interstate 5 is a surprising place to encounter art — especially a cluster of iridescent collages ... through the “hidden gem” park, a 7.5-acre forest ...

The frog, Ranitomeya aquamarina, sports metallic copper legs with dark-crimson spots, and a back covered in iridescent green stripes. The frogs are hard to detect, because they are just 1.5–2 ...