Pargasite - Franklin, NJ

Description

Here we have a specimen of the amphibole edenite or possibly pargasite. The pargasite appears here as scattered sub-vitreous, medium green amphibole grains. There is no documented analysis for this specimen. The name amphibole (Greek αμφιβολος - amphibolos meaning 'ambiguous') was used by René Just Haüy to include tremolite, actinolite, tourmaline, and hornblende. The group was so named by Haüy in allusion to the protean variety, in composition and appearance, assumed by its minerals. This term has since been applied to the whole group of amphiboles worldwide. It is an extensive and complex group of minerals presently divided into a group/subgroup/root-name hierarchy. Individual members can often only be correctly identified by a combination of chemical-analytical, X-ray diffraction, and spectroscopic methods. There are grains of a weathered sulfide made evident by the ocherous orange spots seen throughout the entire matrix. The remaining portions of the matrix consist of coarse white calcite. The edenite/pargasite DOES fluoresce a moderate blue-white under shortwave (254nm) ultraviolet light. The amphiboles are one of the more common mineral species to occur in the marble, of which there are as many as 50 species. It is, however, uncommon to find rich fluorescent masses such as this specimen. The Franklin Marble is classified as a metasedimentary deposit and dates to 1.1 billion years old. This specimen is most suitable for the Franklin and Sterling Hill mining district collectors who want to expand their collection with a diverse suite of marble mineral assemblages.
Dimensions are
13.9x13.7x6.9cm - 5½x5½x2¾in.
Please note the centimeter cube and inch bar for scale.
Weight in grams and ounces:
1528.6g - 53.92oz.
From a
Franklin Marble quarry, Franklin, NJ.
The previous collection this specimen was in is
#114, Earl Verbeek.
#114 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. ---