Hübnerite : MnWO4

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Copyright © 2010 Harold Moritz
minID: A92-7C0

Hübnerite : MnWO4

Note: Hübnerite is not listed in our database for this locality. This specimen may be misidentified or the mindat list of rocks and minerals at this locality may be incomplete.

Dimensions: 5.5 cm x 5 cm x 2 cm

A crystal with no data that I originally thought was tantalite, but after EDS analysis has proven to be hübnerite. After looking at many mindat.org, Yale Peabody Museum catalog photos of "wolframite", ferberite and huebnerite, and a "wolframite" specimen on display at Wesleyan University, and given the age of this specimen (it came from someone who did much collecting in the 1960s) the best match is Zinnwald. The EDS analysis showed Mn/(Mn+Fe) = 0.63 and thus is hübnerite. See child photo for spectrum.

This photo has been shown 320 times
Photo added:23rd Jun 2010
Dimensions:1708x1708px (2.92 megapixels)
Date/Time of Photo:21st Apr 2011 17:53:29
Software:Adobe Photoshop CS3 Windows
Exposure time:1/0s
Focal Length:100mm
Focal Length (35mm film equivalent):150mm
ISO speed:100

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PhotosTantalite-(Mn) - Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA

17th Oct 2016 17:49 BSTHarold Moritz Expert

An EDS analysis, and a review of physical properties, shows this crystal to be huebnerite! It was given to me in the 1970s, from someone who collected a lot at Strickland, but who had other things as well. The physical properties, which in many ways are close to tantalite (including the SG of this crystal of 7.0), along with the potential location, pointed me to a tantalite ID. However, the EDS says otherwise (there is no Ta or Nb, and big W peaks), and with the lack of matrix it could be from anywhere. The mineral is clearly manganese dominant with Mn/(Mn+Fe)=0.63 but falls near the middle of the Fer-Hueb series. So the real question now is "Where is it from?" so I can move the photo. Given its "age" and what was available to the NE US collector then, I reviewed the mindat photos for ferberite, huebnerite and wolframite. I think it is probably Panasqueira http://www.mindat.org/loc-2591.html, but also perhaps Zinnwald http://www.mindat.org/loc-759.html. Yes, I know mindat does not list huebnerite from these places, but the crystal forms on my piece show match many "wolframite" crystals from these places, and as noted, this is near the middle of the series and shows no red coloration or translucency. If a consensus cant be reached I will ask the photo be deleted. Thanks!
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