This interesting and unique fluorescent specimen looks like something you'd expect to find in an underwater coral reef. Collected from...

Red trinitite is technically not a true mineral, because it was not formed through a geologic process. Rather, this brick-red colored...

Sawn slab of zinc ore consisting of sphalerite, galena, and other unidentified minerals, from the Ophir Hill Mine, Tooele County, Utah. ...

At first glace, this looks like a classic selenite rosette from the Red River Floodway, Manitoba, Canada. But no, guess again! This...

Tiffany stone is a complex rock composed of opalized fluorite with bands and veins of chalcedony, manganese oxide and bertrandite. The...

Yttrofluorite is a variety of fluorite in which the rare earth element yttrium substitutes for some of the calcium in the fluorite (CaF2)...

Yttrofluorite is a variety of fluorite in which the rare earth element yttrium substitutes for some of the calcium in the fluorite...

One of the many specimens collected in the Green Monster Mine, Sandy Valley, Nevada, in early January 2022. The blue-white fluorescent is...

Rare green fluorescent botryoidal fluorite from the Fourmile Creek area, near Canon City, Fremont County, Colorado. Fluorite in...

Brightly fluorescent, submillimeter, octahedral crystals of scheelite on matrix; from the Ophir Hill Mine, Tooele, Utah. This specimen...