Min. [See def. and -ITE1.] A name for ammonia alum (see ALUM 2), esp. as occurring native in brown coal at Tschermig in Bohemia.
1868. Dana, Min. (ed. 5), 651–2. Tschermigite. Ammonia Alum. This salt is manufactured from the waste of gas works, and used extensively in place of potash alum.
