Min. [Named after a Swede, C. Tenger, who examined it: see -ITE1.] According to Svanberg and Tenger, a carbonate of yttrium, found as a whitish coating on gadolite.
1868. Dana, Min. (ed. 5), 710.
1889. Nature, 19 Dec., 163/1. Many more [minerals], such as cyrtolite, molybdite, allanite, tengerite … have been found.
