Tiemannite
a massive granular mineral, first found at several localities in the Harz Mountains, but since at several places in the United States; hardness, 2.5; sp. gr., 7.1-7.37; luster, metallic; color, steel to blackish lead-gray. Composition: A selenide of mercury.
Dana suggests the formula HgSe, but points out that the analyses mostly correspond with Hg.Ses, which requires selenium, 24.8, mercury, 75.2-100. TIENTSIN (te-ent-sen'), a large city and river port of China, in the province of Chihlî, on the right bank of the Peiho; 34 miles from the mouth of the river. It is the port of the city of Peking, from which it is distant 80 miles S. E. The river is generally frozen over from about Dec. 15 to March 15, and the business at other times carried on by means of boats and junks is taken up by sledges, which swarm on the river. By the treaty of Tientsin, signed here in 1858, the port was declared open; and a British consulate was established in January, 1861, while part of the allied troops were still here. In 1881 Tientsin was connected by telegraph with Shanghai (the line extending to Peking); and there is a railway from Tientsin to the mouth of the Peiho, which will ultimately be extended of about $35,000,000. There is also a large and rapidly increasing transit trade to Shanghai. It does an export business with Russia via Siberia. Pop. about 800,000. See BOXERS.