Tschermigite is a mineral form of

ammonium alum Ammonium aluminium sulfate, also known as ammonium alum or just alum (though there are many different substances also called " alum"), is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2·12H2O. I ...

, formula N H₄ Al( S O₄)₂·12(H₂O). It is found in burning coal seams,

bituminous Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term ...

shale and

fumarole A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

s. Because of its extreme water solubility it is unlikely to persist except in the dryest of conditions. Discovered in 1852 at Cermiky, also known as Tschermig in Bohemia. It is colorless and named for where it was discovered.

References

Ammonium minerals Aluminium minerals Sulfate minerals Cubic minerals Minerals in space group 205 {{sulfate-mineral-stub