Willemite

Name:
Willemite
Detailed information:

M Formula:	Zn2SiO4
Properties:
Color yellow, green, red, brown, white; luster vitreous to resinous; sometimes fluoresces in UV light. Mohs hardness 5.5, d 3.3.
Occurrence:
New Jersey, New Mexico, Africa, Greenland.
Use:
Ore of zinc, a phosphor.