Roscoelite is a rare mineral with a distinctive green color and metallic luster. It is primarily composed of vanadium, aluminum, and potassium and occurs in hydrothermal environments in conjunction with various sulfide minerals. In addition to Roscoelite, this mineral may also be referred to as "vanadium mica" due to its high vanadium content. Other synonyms for Roscoelite include "green mica", "potassium vanadium mica", and "vanadiotantalite". This mineral has a number of industrial applications, including as a source of vanadium and as a catalyst in certain chemical processes. It is also highly valued by mineral collectors due to its rarity and aesthetic appeal.