The Mineral Willemite

Willemite mineral is a zinc silicate mineral; it is fluorescent as yellow-green to orange under ultraviolet light. It may occur in many different colors in daylight. The Willemite mineral is an important ore of zinc at some of its widespread localities. It is truly a unique mineral. Willamette is one the silicate minerals that have the trigonal symmetry. The symmetry is more common among carbonates than silicates. Its crystal habit is its wonderful florescence. It is one of the best examples of a fluorescent mineral. The willemite is suitable for cutting hexagonal, prismatic crystals. It is found in grains and granular masses. Willemite mineral is found in marble and is associated with limestone.  

Willemite is the most important minerals in carbonate hosted ore deposits. Numerical geochemical modeling is used to examine Willemite under hydrothermal conditions. Recently, there is increased interest in zinc deposits because of high zinc grades. Willemite is an ore mineral with lesser Mimitite and Hedyphane. Resulting from various depositional mechanisms the texture of the Willamette is heterogeneous.

Willemite mineral is found in Franklin, New Jersey in amazingly large quantities. It may also occur in USA, Belgium, sterling hill, Mammoth mine, Morsnet, Nambia, Sterling Hill and Greenland.

Willemite has the ability to reflect light which makes it visible to the human eye. It has the unique ability to absorb light temporarily and instant release a light of a different wavelength.

Chemical Formulae

Derivation of Name
Willamette mineral was named in the honor of King William I of Netherlands, who was known as King Williams.

Physical Characteristics

Color is usually colorless but can be tinted yellow, red green and blue

Luster is vitreous to resinous.

Transparency: crystals are transparent to translucent.

Crystal system: trigonal

Cleavage is good in one direction.

Hardness is 5.5

Fracture is conchoidal to uneven.

Streak is white.

Specific gravity is approx. 3.9-4.2

Dispersion 0.027
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