Fluorite, apatite - Franklin, NJ

Description

An interesting and rich example of fluorite with calcite from the Franklin mine. Here we have a cabinet-sized specimen with grains and small sections of pale pink to red, vitreous, semi-translucent fluorite. The fluorite has a pronounced cleavage. There are grains and small sections of off-white to gray, coarse, vitreous calcite throughout the matrix. There are abundantly scattered grains of black, metallic franklinite. There are numerous flakes of a black-bronze, splendent mica throughout the matrix. The remainder of the matrix is a dark green-gray massive augite with a very minor amount of scattered willemite. Lastly, there are numerous scattered grains of dark green apatite. The fluorite fluoresces a weak aqua-green, the calcite fluoresces a moderate red, and the willemite a moderate green under shortwave (254nm) ultraviolet light. The apatite fluoresces a moderate orange under midwave (315) ultraviolet light. This type of fluorite was once known as "chlorophane." It is merely a varietal name for this type of fluorite. It is known to be daylight sensitive, whereas prolonged exposure bleaches the fluorescent response to the point of non-fluorescence unless the specimen was broken open to reveal fresher material. This type of fluorite warrants storage in aluminum foil or a light-tight box to prevent fluorescent fading. This is a worthy mineral specimen for the advanced collector who wants to expand the diversity of their mineral collection.
Dimensions are
12.3x7.5x7.5cm - 4¾x3x3in.
Please note the centimeter cube and inch bar for scale.
Weight in grams and ounces:
753.8g - 26.59oz.
From the Franklin mine, Franklin, NJ.
The previous collection this specimen was in is
#86, Phamily Minerals.
#86 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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We Buy Collections
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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. ---