Hancockite, Datolite - Franklin, NJ
Item History & Price
| Reference Number: Avaluer:31667812 | Country/Region of Manufacture: United States |
| Franklin Mineral Museum: Mineral species |
A rare species from the Franklin mine. Hancockite is a member of the epidote supergroup and is locally known as the "Parker Shaft" suite of minerals, collectively known as the lead silicates. For more information about the "Parker Shaft" suite of minerals and this locality within the Franklin mine boundaries, visit this link, mindat.org/loc-226510. Hancockite was named in 1899 by Samuel L. Penfield and Charles H. Warren in honor of Elwood P. Hancock of Burlington, Burlington County, New Jersey, ...a landscape artist and a prominent collector of the day. Hancock started mineral collecting about 1854, and his collection was bequeathed to Harvard University in 1916. Franklin is the type locality of hancockite. It is not known from the Sterling mine in Ogdensburg but has been found in other localities worldwide. For a short period, this species was renamed by the Epidote Subcommittee of the CNMMN (Commission on New Minerals and Mineral Names) in 2006, as epidote-(Pb), and recently the name was restored to hancockite by the IMA (International Mineralogical Association) in 2015.
This is a very rich, small cabinet-sized specimen. This type of hancockite is the massive, dull lustered, characteristic "brick-red" variety. Covering one face of the specimen is a thin layer of glassy white to colorless, semi-translucent datolite. There are a few minor sections of yellow, massive, semi-vitreous yellow axinite-(Mn) and glassy, pale green willemite grains. Also associated are a few minor flakes and sections of black, splendent hendricksite and sections and grains of black, metallic franklinite scattered throughout the matrix. The specimen sits nicely and securely for optimal viewing. This is a rare mineral species, and examples of this sort are difficult to obtain today.
Dimensions are 6.1x4.6x4.9cm - 2½x1¾x2in. Please note the centimeter cube and inch bar for scale.Weight in grams and ounces: 210.09g - 7.44oz.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. There may or may not be any fluorescent mineral specie(s) present in this specimen. A fluorescent photograph may not have been included for several reasons. Chief among these are; there may not be any fluorescence in this particular specimen. If there are fluorescent specie(s), it is considered minor and not the specific specie(s) of note in this specific specimen. Another reason not including a fluorescent photograph is that some mineral species may be too weak to record even with modern photographic technology and photo-enhancement. If such a fluorescent species were present in this specimen, it would be noted in the descriptive text. 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. ---
This is a very rich, small cabinet-sized specimen. This type of hancockite is the massive, dull lustered, characteristic "brick-red" variety. Covering one face of the specimen is a thin layer of glassy white to colorless, semi-translucent datolite. There are a few minor sections of yellow, massive, semi-vitreous yellow axinite-(Mn) and glassy, pale green willemite grains. Also associated are a few minor flakes and sections of black, splendent hendricksite and sections and grains of black, metallic franklinite scattered throughout the matrix. The specimen sits nicely and securely for optimal viewing. This is a rare mineral species, and examples of this sort are difficult to obtain today.
Dimensions are 6.1x4.6x4.9cm - 2½x1¾x2in. Please note the centimeter cube and inch bar for scale.Weight in grams and ounces: 210.09g - 7.44oz.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. There may or may not be any fluorescent mineral specie(s) present in this specimen. A fluorescent photograph may not have been included for several reasons. Chief among these are; there may not be any fluorescence in this particular specimen. If there are fluorescent specie(s), it is considered minor and not the specific specie(s) of note in this specific specimen. Another reason not including a fluorescent photograph is that some mineral species may be too weak to record even with modern photographic technology and photo-enhancement. If such a fluorescent species were present in this specimen, it would be noted in the descriptive text. 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. ---
