Augite crystals - Sterling Hill, Ogdensburg, NJ

Description

A large augite crystals specimen. Augite is a calcium magnesium iron silicate, and here we have a group of vitreous, black well-formed augite crystals. There are portions of the specimen with very coarse, pink-white, translucent calcite that has etched away with a mild acid to expose the augite crystals. Augite is a clinopyroxene, and it is a member of the pyroxene group. The specimen has several large crystals with several smaller crystals throughout the specimen. Augite crystals belong to the monoclinic crystal system, and this group has the simple monoclinic prismatic form. This crystal group is from the Sterling mine, and finding recognizable and unaltered, intact augite crystals is uncommon. This group could sit in several positions, and it is considered an all-around specimen. A neat large recognizable augite crystal that would fit nicely in any mineral collection.
Dimensions are
11.2x14.9x11.0cm - 4½x5¾x4¼in.
Please note the centimeter cube and inch bar for scale.
Weight in grams and ounces:
2375.2g - 83.78oz.
From the Sterling mine, Ogdensburg, NJ.
The previous collection this specimen was is #80, L.W.Wimple.
#80 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
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The shortwave wavelength is
254nm
or otherwise known as
UV C
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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.
There may or may not be any fluorescent mineral species present in this specimen. A fluorescent photograph may not have been included for several reasons. Chief among these are; there may not be any fluorescence in this particular specimen. If there are fluorescent species, it is considered minor and not the specific species of note in this particular specimen. Another reason not including a fluorescent photograph is that some mineral species may be too weak to record even with modern photographic technology and photo-enhancement. If such fluorescent species were present in this specimen, it would be noted in the descriptive text.
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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