Esperite, Clinohedrite, Hardystonite, Willemite - Franklin, NJ
Item History & Price
| Reference Number: Avaluer:31663204 | Country/Region of Manufacture: United States |
| Franklin Mineral Museum: Fluorescent mineral species |
A four-color example of one of the great Franklin mine fluorescent classics and esperite is one of Franklin's king fluorescent species. It is a rare fluorescent species, and the canary yellow fluorescent color makes for a bright and startling appearance. Esperite is a lead calcium zinc silicate and was originally named "calcium larsenite' but renamed in 1965 after Esper Signius Larsen, Jr. petrologist and Professor of Geology at Harvard University. Franklin is the type locality of espe...rite and has not been found at the sister deposit at Sterling Hill. It is reported from another locality in South America. The most indicative assemblage of esperite is massive, black metallic franklinite with "swirls" of resinous to dull, orange zincite. There are spots and grains of dull, greasy white to pale brownish esperite and large greasy white hardystonite sections. Hardystonite is a calcium zinc silicate, and the Franklin mine is the type locality for hardystonite. It was named in 1899 by John E. Wolff after Hardyston Township, Sussex County, locality of the Franklin orebody before the incorporation of Franklin Borough in 1913. Hardyston Township surrounds the borough of Franklin today. There are some very minor spots of associated willemite, and it is usually a sub-vitreous white or very pale green in this type of assemblage. Willemite is frequently associated and makes for a pleasing contrast in ultraviolet light. There is one face of the specimen that has a typical coating of colorless, transparent clinohedrite. The Franklin mine is the type locality for clinohedrite, a calcium zinc silicate hydrate, and it was named in 1898 by Samuel L. Penfield and Harry W. Foote from the Greek κλινειν "to incline and εδρα hedra, for face, for the characteristic inclined faces of the crystals. Esperite fluoresces a bright canary yellow, willemite a bright green, hardystonite a moderate blue-violet, and the clinohedrite a bright to moderate orange. All best seen under shortwave (254nm) ultraviolet light. This is a fine example of a four-color fluorescent specimen and suitable for any fluorescent mineral collector.Dimensions are 7.6x5.2x4.2cm - 3x2x1½in. Please note the centimeter cube and inch bar for scale.Weight in grams and ounces: 241.4g - 8.52oz.From the Franklin mine, Franklin, NJ.
The previous collection this specimen was in is #192, Roslyn Franklin.
#192 is the museum's Collection Sale number previously offered in the museum shop.
>>> We do COMBINED SHIPPING for multiple items. To request an invoice from us that combines shipping ALWAYS, click the Add to cart button on eBay to add items until you are done. DO NOT PROCEED to checkout, instead click the Request Total from Seller button. <<< === There is an instructional video on how to request combined shipping is here https://www.youtube.com/watch?v=FvDe7Fg7R4Q ===
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.
>>>> We Buy Collections <<<<
DISCLAIMER: Every reasonable effort was made to accurately identify the mineral specie(s) noted in each specimen. The occasional label from previous collection(s) may misidentify some species, and the current title and description here reflect the latest mineral specie(s) 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 weak response of a fluorescent specimen. 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 only. 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. ---
The previous collection this specimen was in is #192, Roslyn Franklin.
#192 is the museum's Collection Sale number previously offered in the museum shop.
>>> We do COMBINED SHIPPING for multiple items. To request an invoice from us that combines shipping ALWAYS, click the Add to cart button on eBay to add items until you are done. DO NOT PROCEED to checkout, instead click the Request Total from Seller button. <<< === There is an instructional video on how to request combined shipping is here https://www.youtube.com/watch?v=FvDe7Fg7R4Q ===
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.
>>>> We Buy Collections <<<<
DISCLAIMER: Every reasonable effort was made to accurately identify the mineral specie(s) noted in each specimen. The occasional label from previous collection(s) may misidentify some species, and the current title and description here reflect the latest mineral specie(s) 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 weak response of a fluorescent specimen. 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 only. 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. ---
