Kraisslite - Sterling Hill, Ogdensburg, NJ

Description

A rich example of a one locality mineral species. Kraisslite is found only at the Sterling mine in Ogdensburg, which is the type locality. It is a complex arsenate and a member of the renowned suite of arsenates from Sterling Hill. Kraisslite is a relatively recent mineral species only approved in 1977 and named after a married couple, the late Fred and Alice Kraissl. They were avid micromounters specializing in the minerals of the Franklin and Sterling Hill mining district. Alice had a splendid micromount collection representing many exotic and rare mineral species from the Franklin and Sterling Hill district. This collection has since been dispersed. It is a rare species but not as rare as other arsenate suite members at Sterling Hill. It occurs as abundant, glittery bronze scales and plates on an open fracture surface.
The matrix is typical "salt and pepper" textured brown ore found at Sterling Hill. It consists of granular, dull lustered brown willemite and black, metallic franklinite matrix. The specimen does sit nicely for an optimal display. A rich specimen for the mineral collector assembling a suite of arsenates as miniatures from the Sterling mine.
Dimensions are
8.4x3.8x6.3cm - 3¼x1½x2½in.
Please note the centimeter cube and inch bar for scale.
Weight in grams and ounces:
315.5g - 11.13oz.
From the
Sterling mine, Ogdensburg, NJ
.
The previous collection this specimen was in is
#501, Franklin Mineral Museum deaccessioned with an attached tag that reads 1373.
#501 is the museum's Collection Sale number previously offered in the museum shop.
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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.
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DISCLAIMER: Every reasonable effort was made to identify the mineral species noted in each specimen accurately. The occasional label from previous collection(s) may misidentify some species, and the current title and description here reflect the latest mineral species 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 fluorescent specimen's weak response.
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.
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