Tungsten
a rare metallic element, found in wolfram, which is a tungstate dark-gray powder or in heavy iron-gray of iron and manganese, and likewise found in scheelite, which is a tungstate regia and nitric acid convert it into tungstic acid. When 10 parts of this of lime. The metal (Swedish, tung-sten, "heavy stone") is obtained either as a metal are alloyed with 90 of steel a mass bars, which are very hard and difficult of fusion, and have a sp. gr. of 19.1. Aqua tungstic acid. When 10 parts of this of extraordinary hardness is obtained.
Tungsten forms two compounds with oxygen-viz., a binoxide, WO2, which is TUNGSTITE obtained in the form of a brown powder by heating tungstic acid to low redness in a current of hydrogen, and which does not form salts with acids; and an acid oxide, known as tungstic anhydride, WOs.
Various tungstates have been formed and examined. Of these the most important is the tungstate of soda, which answers admirably as a means of preventing muslin, etc., from bursting out in a flame when brought in contact with fire.