They are unique because the major zinc minerals, zincite, franklinite, and willemite, are oxides and silicates rather than sulfides. However, at Sterling Hill minor granular sphalerite occurs in the ...

The most powerful to the β radiation is willemite, a zinc silicate, which gives a magnificent green fluorescence, and is probably quite free from any phosphorescence after the action of the rays ...

THE fluorescent screen mostly used in electron microscopes and other similar instruments is composed of the well-known willemite, of which there seems to exist a great variety, differing widely so ...