Scorodite

Benitoite is a scarce and precious stone, so precious in fact it has been bestowed the honor of being the State Gemstone of California. Cut and polished specimens of benitoite are costly, commanding up to $5,000 per carat when perfect clarity and color are present. It is not a gem you'll see in most collections!

Anglesite is a lead-containing mineral that forms crystals of varying colors. Occasionally mined for its lead content (lead has tons of commercial and industrial uses), high-quality specimens are also sought after by collectors. Crystals occasionally exhibit exquisite colorations, with blue, green, orange, violet, and yellow-hued varieties being particularly prized. Though found in multiple locations across the world, many collector-quality anglesites come from Morocco.

When studied under different light sources, ilvaite will almost magically change colors depending on how you look at it. It isn't the dull black gem that you might think! It was first found on Elba Island off the coast of Italy back in 1811.

Greenstone is a field term used to describe any dense, dark-green altered or metamorphosed basic igneous rock. The distinctive green color of greenstone is typically caused by the presence of epidote, actinolite, or chlorite.

Hornblende is a term commonly used to describe dark green to black amphiboles. While it is not officially recognized as a distinct mineral, the name is widely used in the field to refer to this particular group of minerals. Hornblende minerals are often found in igneous and metamorphic rocks. Hornblende is often associated with other minerals like feldspar and quartz. Its presence in rocks provides valuable clues about their geological origins and history.

Legrandite is an extremely rare mineral prized by collectors for its yellow or yellow-orange color. Although exceptionally beautiful, this mineral doesn't find its use in jewelry because of its fragility. The smaller specimens are transparent, but the bigger the crystal the more opaque it gets.

Being a very rare, crystalline mineral, bixbyite is highly sought by mineral collectors. It is particularly prized when in the so-called "matrix" form - a matrix is a fine groundmass that has embedded crystals or larger grains emerging from it. Bixbyite is a manganese iron oxide, but the content of iron can vary significantly across samples. It is mined in the Kalahari Desert, South Africa.

Connellite is a rare mineral occurring in transparent blue. These minerals can be found in spiky formations with delicate spines and fibers. Connellite is named after chemistry professor, Arthur Connell, from Edinburgh, Scotland. This mineral has since been discovered in a couple of hundred locations over several continents, though in low concentrations.