Calcite, Willemite Mylonite - Sterling Hill, Ogdensburg, NJ
Item History & Price
| Reference Number: Avaluer:31682508 | Country/Region of Manufacture: United States |
| Franklin Mineral Museum: Mineral species |
Geology in action! Don't let that word scare you off from considering this specimen. Here is a calcite and willemite mylonite from the Sterling mine. The matrix is composed mainly of two mineral species. The most prominent is the dull lustered, white to pale pink-white fine-grained calcite. Next comes the white to pale gray, dull lustered willemite, interspersed with the calcite matrix. The interesting part is when the specimen is viewed under shortwave (254nm) ultraviolet light, the w...illemite shows a smearing, all of which are oriented in one direction. This indicates the specimen had undergone plastic deformation. Surprisingly rock can be deformed under the proper geologic conditions, and this is a nice example of deformation. It COULD be the beginnings of a mylonite. Mylonites are ductilely deformed rocks formed by the accumulation of considerable shear strain in ductile fault zones. It is generally agreed that crystal-plastic deformation must have occurred and that fracturing and cataclastic flow are secondary processes in the formation of mylonites.
The willemite does fluoresce under shortwave (254nm) ultraviolet light, a bright green, and the calcite a bright red. The willemite is NOT phosphorescent. The specimen does sit on one edge, securely for optimal viewing. This is a neat discussion specimen for those serious mineral collectors.
Dimensions are 7.2x7.5x3.1cm - 2¾x3x1¼in. Please note the centimeter cube and inch bar for scale.Weight in grams and ounces: 225.9g - 7.97oz.From the Sterling mine, Ogdensburg, NJ.
The previous collection this specimen was in is #170, Albert Furman.
#170 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 willemite does fluoresce under shortwave (254nm) ultraviolet light, a bright green, and the calcite a bright red. The willemite is NOT phosphorescent. The specimen does sit on one edge, securely for optimal viewing. This is a neat discussion specimen for those serious mineral collectors.
Dimensions are 7.2x7.5x3.1cm - 2¾x3x1¼in. Please note the centimeter cube and inch bar for scale.Weight in grams and ounces: 225.9g - 7.97oz.From the Sterling mine, Ogdensburg, NJ.
The previous collection this specimen was in is #170, Albert Furman.
#170 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. ---
