The two crystalline forms of sulfur and some of their varieties according to Mitscherlich. Nos. 1–6 represent either natural crystals or crystals obtained by evaporation from dissolutions in carbon disulfide. Nos. 7–11 show crystals that emerged from melted sulfur (Mitscherlich, 1896, Table IV). Since Gadolin (1871) they have been known as the `rhombic' and the `monoclinic' form, respectively.