Discover natural Willemite with Mangano Calcite from Zambia, an unusual fluorescent mineral association displaying vivid green and orange fluorescence when viewed under ultraviolet light.

These specimens have been observed responding under Short Wave (SW), Medium Wave (MW) and Long Wave (LW) UV, with the most prominent fluorescent response occurring under SW UV. Willemite is particularly renowned amongst fluorescent mineral collectors for its characteristic green fluorescence, while manganese-bearing calcite can produce contrasting orange to reddish-orange fluorescence.

Every specimen is naturally unique, with variations in shape, colour, mineral distribution, surface texture and fluorescent response. Each available piece has been individually photographed so you can select the exact specimen you will receive.

Choosing Your Specimen

There are 11 individually photographed specimens available, with each piece sold separately.

Select your preferred specimen from the variant menu to view its individual price and corresponding photographs.

You will receive the exact specimen selected from the variant menu and shown in the photographs.

UV Fluorescence

Fluorescence naturally varies between individual specimens. Colour and intensity can also differ according to UV wavelength, lamp output, ambient lighting and viewing conditions.

Scientific Information

What Causes the Fluorescence?

Fluorescence occurs when certain minerals absorb ultraviolet radiation and emit part of that energy as visible light.

Willemite is well known for producing green fluorescence, while manganese can act as an activator in calcite and produce contrasting orange to reddish fluorescence. The precise appearance and intensity depend on the mineral chemistry and distribution within each specimen as well as the UV wavelength used.

Viewing Your UV Mineral

For the best fluorescent response, view the specimen in a dark environment with an appropriate mineral UV lamp.

Using different wavelengths can reveal changes in fluorescence colour, distribution and intensity. The appearance under SW, MW and LW UV may therefore differ considerably.

Always follow the UV equipment manufacturer's safety instructions and avoid looking directly into a UV light source.

Care Instructions

Store your specimen in a dry, stable environment and handle it carefully to protect its natural mineral surfaces. Remove loose dust with a soft, dry brush where appropriate and avoid harsh household cleaning products.

Store separately from harder specimens where possible to reduce the risk of accidental scratching or damage.

Frequently Asked Questions

Is Willemite with Mangano Calcite fluorescent?

Yes. These specimens have displayed fluorescence under SW, MW and LW ultraviolet light, although the intensity and appearance vary between individual pieces.

What colour does Willemite with Mangano Calcite fluoresce?

Green and orange fluorescence has been observed in this material. Willemite is associated with the green response, while manganese-bearing calcite can produce contrasting orange to reddish fluorescence.

Which UV wavelength produces the strongest response?

The most prominent response observed in these specimens occurs under Short Wave (SW) UV. Fluorescent responses have also been observed under MW and LW UV.

Where are these specimens from?

These Willemite with Mangano Calcite specimens originate from Zambia.

Will I receive the exact specimen photographed?

Yes. Choose your preferred variant and you will receive the exact specimen shown in its corresponding photographs.

Will every specimen fluoresce identically?

No. These are natural mineral specimens, so mineral distribution and fluorescent intensity vary from piece to piece. UV wavelength, lamp intensity and viewing conditions can also affect the appearance.

Location

Zambia

Please Note

Every specimen is naturally unique, so variations in shape, colour, texture, mineral distribution and fluorescence are expected.

Fluorescent colours may appear differently in photographs than they do when viewed directly. UV response can also vary according to the lamp, wavelength, intensity and surrounding light conditions.

You will receive the exact specimen selected from the variant menu and shown in the corresponding photographs.

Shipping Information

We offer reliable and carefully managed delivery services to ensure your order arrives safely and securely.

Royal Mail Tracked 48 — £3.80
Available for smaller parcels weighing up to 2kg, with an estimated delivery time of 2–3 working days after dispatch.

DHL / DPD Courier Delivery — £6.87
Available for UK mainland deliveries weighing up to 20kg, providing a reliable service for larger or heavier orders.

All orders are carefully packaged to protect your specimens during transit.

Shipping options and applicable charges are confirmed at checkout.

Thank you for choosing GeoFossils.