Sphalerite

Not only a basic zinc sulfide, but also my favorite mineral.

Goethite

Essentially the mineral form of rust

Crystallized form of barium sulfate

Makes some of the most well known gemstones

Similar to biotite, but is lighter in color

One of the most common rock forming minerals

The only naturally magnetic mineral

Just a cooler name for salt

Thin layers of dark mica

Three varieties shown. From left to right: Alabaster, Selenite, Satin Spar.