Radiating willemite veinlet - Franklin, NJ

Description

An example of radiating willemite. The willemite in this example is vitreous, semi-translucent, and has a white to pale yellow color. The willemite is seen as having a massive texture, and it has elongated,  packed prisms showing a radiating texture. This example has several mineral species associated but commonly has a matrix black, metallic grains of franklinite, and pale yellow grains of willemite. This type of willemite is known for its brilliantly bright fluorescence, and the willemite fluoresces a very bright green under shortwave (254nm) ultraviolet with a long-lived (60 + seconds) phosphorescence.
Willemite was named after King Willem of the Netherlands after the locality at the Moresnet (Plombières-Altenberg-Moresnet) mining district, Verviers, Liège Province, Belgium. This species was previously discovered in 1825 and was identified as "siliceous oxyde of zinc" by Lardner Vanuxem and William Hypolitus Keating. At the time, "siliceous oxyde of zinc" was a synonym of electric calamine, now known as hemimorphite. A series of errors and misunderstandings eventually led to the Belgian location getting the type locality attribution rather than Franklin. Though small this example is, it will fulfill the need of any fluorescent collector wanting a long-lived phosphorescent willemite in their collection.
Dimensions are
5.5x3.6x4.1cm - 2¼x1½x1¾in.
Please note the centimeter cube and inch bar for scale.
Weight in grams and ounces:
118.4g - 4.17oz.
From the
Franklin mine, Franklin, NJ.
The previous collection this specimen was in is #140, Dr. Don Miller with the attached tags that read LA.
#140 is the museum's Collection Sale number previously offered in the museum shop.
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All potential buyers need to be aware that being able to view fluorescent minerals requires an ultraviolet lamp. Most of the minerals from the Franklin and Sterling Hill zinc mining district fluoresce under
shortwave ultraviolet light
.
The shortwave wavelength is
254nm
or otherwise known as
UV C
. Always read the description carefully to determine if the main mineral of interest for a particular specimen will fluoresce.
ALL
fluorescent minerals depicted in our storefront are illuminated by two (2) 9 watt Triple short/mid/longwave AC Model 9SM-110 Way Too Cool LLC ultraviolet lamps, and the shortwave tubes and filters were replaced in late 2018.
There are several available brands and models of ultraviolet lights on eBay and other online sources. For further information on ultraviolet light and fluorescent minerals, copy and paste the following and go to >>>
geology.com/articles/fluorescent-minerals
.
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DISCLAIMER: Every reasonable effort was made to identify the mineral species noted in each specimen accurately. The occasional label from previous collection(s) may misidentify some species, and the current title and description here reflect the latest mineral species identification.
A modest effort was made to depict a fluorescent specimen accurately as possible.
In some cases, overexposure should be expected in select photographs to compensate for a fluorescent specimen's weak response.
All buyers should exercise safe viewing practices regarding the use of ultraviolet light. Visual dark adaption is highly recommended in the optimal viewing of fluorescent minerals. Buyers should also be aware of what type of lighting to view the specimens under. This can result in perceived differences of color and contrast due to color and contrast shifting under various kinds of lights available.
All photographs were taken with a Nikon D5300 digital camera with a Nikon DX AF-S 18-55mm lens attached with a UV filter. Lighting was done with a pair of OSRAM 8.5 watt LED A19 5000K 800 lumens bulbs in brushed aluminum reflectors. The photographs were processed on a color-calibrated flat panel monitor. Do note the Imperial measurement conversion is the nearest equivalent to the listed metric measurement.
--- All photographs appearing on this listing or any other Franklin Mineral Museum listing are the property of the Franklin Mineral Museum. Photographs
can be used strictly for personal use onl
y
. Otherwise, the photographs posted here are protected by U.S. Copyright Laws. They are not to be downloaded or reproduced for public use or distribution in any way without the written permission of the Franklin Mineral Museum. ---