However the company was credited with the discovery of scheelite, a tungsten deposit of commercial importance.
scheelite and wolframite are the principal minerals currently mined for tungsten.
scheelite was hand picked with the use of ultra-violet lights.
Two kinds of tungsten-bearing mineral rocks, called wolframite and scheelite, are mined commercially.
There is thus no scheelite recovery process or pyrolusite concentration technique per se.
British Dictionary definitions for scheelite
a white, brownish, or greenish mineral, usually fluorescent, consisting of calcium tungstate in tetragonal crystalline form with some tungsten often replaced by molybdenum: occurs principally in contact metamorphic rocks and quartz veins, and is an important source of tungsten and purified calcium tungstate. Formula: CaWO4
C19: from German Scheelit, named after Karl Wilhelm Scheele (1742–86), Swedish chemist