Min. [Named by Maskelyne, 1864, after V. von Lang: see -ITE.] A hydrous oxy-sulphate of copper, resembling brochantite.
1865. Reader, No. 114. 259/1. Langite and gypsum.
1867. Readwin, Index Min., 21.
1868. Dana, Min. (ed. 5), 665.
