Minerals identify

Know how to recognize them

Willemite

Silicate mineral

Willemite is a zinc (Zn. It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses, solid brown masses (troostite), and apple-green gemmy masses.

It was discovered in 1829 in the Belgian Vieille-Montagne mine. Armand Lévy was shown samples by a student at the university where he was teaching. Lévy named it after William I of the Netherlands (it is occasionally spelled villemite). The troostite variety is named after Dutch-American mineralogist Gerard Troost

Identification

Color of mineral

White
Grey
Black
Red
Pink
Brown
Yellow
Green
Blue
Azure

Mohs scale ( mineral hardness )

5.5

Density ( specific gravity )

1.691
1.719

Luster ( interacts light )

Resinous
Vitreous

Crystal ( diaphaneity )

Trigonal