When you’re a child, a Saturday morning or a summer afternoon can stretch into eternity. On a Monday, the weekend seemed impossibly distant. At 2 PM, the clock looked like it would never reach 2:30 and the end of the school day.

Nothing evokes the spirit of the American West for me more than cowboy boots and Montana sapphires. As pioneers and gold prospectors journeyed west in the mid-1800s in search of wealth and adventure, they found not only gold sparkling in the spring runoffs, but rounded pebbles of pale blue, pink, yellow and green sapphires.

Mining is hard work in any climate, but it would seem particularly grueling under the heat of the Arizona desert. There is, however, one group of miners who have been at it for millennia who don’t seem to mind the heat at all: ants. Specifically, Pogonomyrmex barbatus, the red harvester ant.

When we think of tourmaline, we might think of far-flung places like Brazil or the Himalayas. But some of the world’s most beautiful (and largest) tourmalines can be found deep in the forests of Maine. The US state is probably known more for its rocky coastlines than for the shinier, more valuable rocks under its hills, more for the frights produced by Maine native Stephen King than for the beauty produced by nature.