 The space group is P21/c, and the unit cell parameters are a = 26.897 Å, b = 15.745 Å, c = 13.565 Å and β = 90.13°.The structure is based on hexagonal closest packing of sulfur atoms with a monoclinic space group.Crystals are short prismatic and thick tabular, but the mineral usually occurs in a massive and compact form.