The mines were visited some years ago by Dr Fritz Noetling, and the mineral has been described by Dr Otto Helm.
For Burmese amber, papers by Fritz Noetling and Otto Helm in Records of Geol.
Noetling (Ber., 1885, 18, p. 2657), who investigated the nitro-, amino-, and oxy-xylenes in their relations to the three xylenes or dimethyl benzenes.
Noetling, " The Development and Subdivision of the Tertiary System in Burma," Rec. Geol.
Noetling, " The Occurrence of Petroleum in Burma, and its Technical Exploitation," Mem.