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...

Fluorite cubes (fluorescent blue) and powdery cerussite (fluorescent yellow) from the Blanchard Mine, Bingham, NM, USA. The overall size...

To mineral collectors, the Sweet Home Mine in Alma, Colorado is best known as a producer of some of the finest rhodochrosite specimens in...

This lovely 2-color fluorescent specimen contains willemite and sphalerite, and is from the Nelly James Mine (also known as Miller...

This beautiful 4-color rock is from the Nelly James Mine (also known as Miller Canyon), in southern Arizona. At its best under short...

This beautiful 3-color fluorescent rock features a combination of calcite, willemite and fluorite and is part of a find made by New...