Fluorite is a popular mineral for collectors, since it is relatively common and inexpensive, and can be found in large, showy crystals of many shades and colors.
Frequently cubic-shaped, and blue, purple, green or yellows [though it can be found in every color of the rainbow, less commonly]. It is frequently found alongside minerals such as calcite, dolomite, galena, and sphalerite.
Some fluorite will fluoresce beautifully under UV light [as the name might suggest].
Some fluorite will even fluoresce in sunlight!
Care should be taken to keep specimens stored out of direct sunlight, as the color may fade, and it should not be stored in water, as this may also damage the specimen.