Large Willemite Crystal - Sterling Hill, Ogdensburg, NJ




Item History & Price

Information:
Reference Number: Avaluer:4314992Country/Region of Manufacture: United States
Franklin Mineral Museum: Mineral crystals species
Original Description:
A good, well-formed, large crystal of willemite. This is a large, tan-pale brown,  semi-vitreous to dull lustered, prismatic willemite. There is a flat termination and the c-axis (the long axis) is well developed and quite recognizable. Viewed on end the hexagonal outline is clearly seen. There are large inclusions of coarse, black metallic franklinite and coarse, white, sub-vitreous calcite in the willemite crystal. This type of willemite was formerl...y known as "troostite". This is NOT a valid mineral species, but merely an old-fashioned, obsolete varietal name. It was named in 1832 by Charles Upham Shepard in honor of Dr Gerard Troost (1776-1850), mineralogist and botanist, State Geologist of Tennessee. "Troostite" was applied to those willemite crystals from the Sterling mine that were short, stubby, pale tan in color and dull lustered. Usually these were embedded in a matrix of coarse, white dull lustered calcite. The willemite fluoresces a bright green under shortwave (254nm) ultraviolet light and the calcite fluoresces a bright red. This specimen is a nice example of this variety and it would be fine for anyone assembling a suite of willemite. There is some potential for mechanically removing the coarse white calcite to reveal more of the willemite crystal though most collectors will leave it as is.Dimensions are 10.3x8.2x5.6cm - 4x3¼x2¼in. Please note the centimeter cube and inch bar for scale.From the Sterling Mine, Ogdensburg, NJ.The previous collection this specimen was in is #123, the Princeton University Collection with an attached tag that reads 1/381, 17009 and F236. The tags were 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, [link removed by eBay].>>>> 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. ---



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