Gray - Brown Willemite Crystals - Franklin, NJ
Item History & Price
| Reference Number: Avaluer:4358290 | Country/Region of Manufacture: United States |
| Franklin Mineral Museum: Mineral crystals species |
An unusual group of willemite crystals. Here we have a group of terminated willemite crystals on one end of the specimen. The crystals are well formed, quite recognizable prismatic forms with a dull luster and have a pale gray-brown color. The remaining part of the matrix is massive black, metallic franklinite intermixed with dull luster, off-white grains and sections of willemite. The willemite does fluoresce a bright green under shortwave (254nm) ultraviolet light. A cleaning so...lution of 50% vinegar and 50% hydrogen peroxide MAY improve the overall appearance of the crystals and the whole matrix. Timed immersion of 30 seconds to one minute intervals by scrubbing with a stiff nylon brush in between and rinse in plain water. Definitely suited for the connoisseur of willemite or as a challenge for a collector wanting to improve a specimen's quality.Dimensions are 8.9x5.2x5.8cm - 3½x2x2¼in. Please note the centimeter cube and inch bar for scale.From the Franklin Mine, Franklin, NJ.The previous collection this specimen was in is #123, the Princeton University Collection with an attached tag that reads 20/381. The tag was attached at Princeton University.#123 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 mineral go to this link, https://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. ---
