The Willemite Gemstone: A Hidden Treasure in the World of Minerals

Gemstones have always captivated humans with their beauty, rarity, and allure. From diamonds to rubies, each gem possesses its unique charm. However, amidst the well-known gemstones, a hidden treasure deserves recognition: Willemite.

With its vibrant hues and fascinating properties, this captivating gemstone has an intriguing history and a range of applications that make it truly remarkable.

What is Willemite?

Willemite is a rare zinc silicate mineral that belongs to the calcite group. It was first discovered in the late 18th century by Martin Heinrich Klaproth, a German chemist who named it after William I, the King of the Netherlands. Willemite is renowned for its remarkable fluorescence, with vibrant green and yellow colors illuminating under ultraviolet light.

A Little History

The history of Willemite dates back to its discovery in 1779. Initially, it was found in mines in the Bergisches Land region of Germany. However, the true potential of this gemstone was unlocked when its fluorescence was discovered.

In the early 20th century, researchers found that Willemite emitted a captivating green glow under ultraviolet light, earning it the nickname “Green Fire.” This remarkable quality led to its increasing popularity among collectors and gem enthusiasts.

Characteristics of Willemite

Willemite possesses several distinctive characteristics that set it apart from other gemstones. It has a vitreous to resinous luster, and its color ranges from colorless to yellow, green, or even red. The most coveted aspect of Willemite is its fluorescence.

When exposed to ultraviolet light, it exhibits an intense green or yellow glow, making it a fascinating gemstone. In terms of hardness, it ranks around 5.5 on the Mohs scale, making it relatively soft compared to other gemstones.


Willemite’s unique qualities have found application in various fields. Its fluorescence makes it a sought-after gemstone for collectors and enthusiasts who appreciate its captivating glow.

We create the most fantastic Willemite keycaps for mechanical keyboards at Keycap Quarry. We also have a bunch of other products made of willemite that will completely astound you.

Furthermore, Willemite is used to manufacture fluorescent pigments, which are used in paints, textiles, and other industrial applications. Additionally, due to its relative softness, it is occasionally used as an ornamental stone for carvings and jewelry.

However, its rarity and limited availability make it less commonly used in these contexts.

Other Intriguing Information

Willemite is often associated with other minerals, such as franklinite and calcite. The Franklin mining district in New Jersey, United States, is renowned for its abundant Willemite deposits. The region has become a significant source of this gemstone and has even inspired the creation of “Franklinite ore” to describe the characteristic mineral assemblage.

Buy Willemite Products from Keycap Quarry

If you are captivated by the beauty of Willemite, We offer a wide range of exquisite products featuring this gemstone. From unique keycaps to jewelry and decorative items, Keycap Quarry showcases the allure of Willemite in its collection.

Furthermore, our expertise and dedication to sourcing high-quality gemstones allow enthusiasts and collectors to acquire their piece of this rare and fascinating gemstone.

Click here to purchase our products.


Willemite, with its remarkable fluorescence and captivating colors, is a hidden treasure in the world of gemstones. From its humble beginnings in the Bergisches Land mines to its popularity among collectors and industrial applications,

Willemite continues to mesmerize and captivate those who encounter it. Whether as a centerpiece in jewelry or a fluorescent pigment in industrial settings, Willemite’s unique qualities make it a gemstone worth appreciating and cherishing.


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