Hancockite, Clinohedrite - Franklin, NJ
Item History & Price
| Reference Number: Avaluer:4269293 | Country/Region of Manufacture: United States |
| Franklin Mineral Museum: Fluorescent mineral species |
A rare species from the Franklin mine. Hancockite is a member of the epidote supergroup and is part of what is locally known as the "Parker Shaft" suite of minerals which is collectively known as the lead silicates. For more information about the suite of minerals and this locality within the Franklin mine boundaries visit this link, mindat.org/loc-226510. Hancockite was named after a prominent collector of the day. Originally named in 1899 by Samuel L. Penfield and Charles H. War...ren in honor of Elwood P. Hancock of Burlington, Burlington County, New Jersey, a landscape artist. 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 around the world. 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 restored to hancockite by the IMA (International Mineralogical Association) in 2015.This is a miniature but rich and very esthetic specimen seen under magnification and even visible with the naked eye once the collector is aware of what is happening here. The entire matrix has cavities, many lined with individual and clusters of brick red hancockite crystals. The crystals are all the characteristic brick red that hancockite is known for and many of the crystals have a bright clean vitreous luster. Close examination will reveal many crystals are also striated along their long axis. The remainder of the matrix is massive axinite-(Mn) and this is apparent by the vitreous, yellow color. There are numerous cavities of transparent, yellow bladed crystals of the axinite-(Mn). The top surface has a large spot of white, semi-vitreous clinohedrite. The axinite-(Mn) fluoresce in many portions of the matrix a deep cherry red and the clinohedrite a bright orange under shortwave (254nm) ultraviolet light. Vuggy specimens of this sort are rare today.
Dimensions are 5.1x2.9x3.9cm - 2x1x1½in. Please note the centimeter cube and inch bar for scale.From the Franklin Mine, Franklin, NJ.The previous collection this specimen was in is #135, George Elling with a attached tag that reads T-10458.#135 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 in eBay to add items until you are done. DO NOT PROCEED to checkout, rather go 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 of the fact being able to view fluorescent minerals requires an ultraviolet light. 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. 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 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 reflects the latest mineral specie(s) identification. A modest effort was made to depict a fluorescent specimen accurately as possible, but some overexposure should be expected in some photographs to compensate for a weak response of a fluorescent specimen.--- 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, and are not to be downloaded or reproduced for public use or distribution in any way without the written permission of the Franklin Mineral Museum. ---
Dimensions are 5.1x2.9x3.9cm - 2x1x1½in. Please note the centimeter cube and inch bar for scale.From the Franklin Mine, Franklin, NJ.The previous collection this specimen was in is #135, George Elling with a attached tag that reads T-10458.#135 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 in eBay to add items until you are done. DO NOT PROCEED to checkout, rather go 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 of the fact being able to view fluorescent minerals requires an ultraviolet light. 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. 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 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 reflects the latest mineral specie(s) identification. A modest effort was made to depict a fluorescent specimen accurately as possible, but some overexposure should be expected in some photographs to compensate for a weak response of a fluorescent specimen.--- 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, and are not to be downloaded or reproduced for public use or distribution in any way without the written permission of the Franklin Mineral Museum. ---
