Fluorite is a mineral that comes in a wide variety of colors, including blue, green, yellow, purple, and pink. The most common color of fluorite is blue, which is caused by the presence of europium impurities. Green fluorite is caused by the presence of chromium impurities, while yellow fluorite is caused by the presence of iron impurities. Purple and pink fluorite are caused by the presence of manganese impurities. Fluorite can also be colorless.