Grey tourmaline is a variety of tourmaline mineral that exhibits a range of grey colors, ranging from light to dark shades of gray. The specific shade of grey can be influenced by the presence of other minerals or elements, such as iron or manganese, in the crystal structure of the tourmaline.
Grey tourmaline is also known by other names, such as schorl, which is the black variety of tourmaline, and dravite, which is the brown variety of tourmaline. Grey tourmaline is often opaque or translucent and can be found in a variety of shapes and sizes, including as elongated prismatic crystals or as flattened, tabular crystals. It is often used as a gemstone and is sometimes included in mineral collections for its unique color and crystal structure.