Magnesium fluoride, typically colorless or white. It's associated with clarity and purification, helping to clear mental fog.
Colorless, White, sometimes Violet or Greenish, forms prismatic or pyramidal crystals
Sellaite is classified as a halide mineral mineral which typically crystallizes in the tetragonal system. Its chemical formula is MgF2. Common crystal habits include prismatic crystals; fibrous, radial, spherulitic.