Zincite : ZnO, Leucophoenicite : Mn2+7(SiO4)3(OH)2, Franklinite : Zn2+Fe3+2O4
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Summary of all keyboard shortcuts
| 1 | Fit image to screen |
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Zincite : ZnO, Leucophoenicite : Mn2+7(SiO4)3(OH)2, Franklinite : Zn2+Fe3+2O4
Largest Crystal Size: 2 mm
Small embedded zincite xls such as this one suggested the presence of a hidden vein in granular (red) zincite, (lavender pink) leucophoenicite, (black) franklinite ore. There was indeed a small vein containing free standing zincite xls as well as leucophoenecite and pyrochroite xls. (See http://www.mindat.org/photo-165311.html for the latter.)
The child photos show some of the zincite xls, an overall view of the vein as well as black (!) chlorophoenicite. See Updates below for further discussion of this "black chlorophoenicite".
May 2016: I have replaced the parent image with a perhaps clearer image. The original parent photo was retained as a child image. Several new photos of other zincite crystals on this specimen have also been added. Two of these ar interestingly encrusted with pseudo-cubic pyrochroite crystals. Strangely, one of the encrusted zincite crystals appears to be tabular and rectangular. I have no explanation for this, but here is a direct link to that photo if you want to see for yourself without slogging through all of the "related" photos: [http://www.mindat.org/photo-749076.html].
I have also added a photo of colorless (i.e. not stained black) chlorophoenicite from a small isolated vug. These crystals have the same habit as the ones that are stained jet black, so the chlorophoenicite ID of the latter seems secure. (But see later updates below.)
In addition, there are numerous well-formed leucophoenicite crystals. These have been posted under a different parent photo, but I have now made the minIDs for both sets of photos the same so that all the photos will show up as "related".
Note added July 2020: The EDS scan for a sample of the "stained chlorophoenicite" turned out to be nearly identical to that for a sample of Zn rich pyrochroite from the Sterling Mine. In particular, no trace of As was seen, which means that it can't be chlorophonicite. Nor can it be "mineral E of Dunn", as had been speculated. See [https://www.mindat.org/photo-165501.html] and/or [https://www.mindat.org/photo-930212.html] for a discussion and [https://www.mindat.org/photo-1004732.html] for the scan. It is very hard to interpret this result. Possibly some further work on this material can be carried out in the near future. (See updates below.)
Second note added July 2020: I recently broke off two more fragments from this specimen. These revealed numerous small cavities with beautiful unstained leucophoenicite crystals along with more of the "chlorophoenicite" blades - both stained and unstained. I will post photos of a few of the best of these as time permits. More directly related to this particular photo, is the fact that in the course of splitting the specimen, one of the new fragments detached itself along a line running exactly along one edge of the zincite crystal pictured here. Talk about living dangerously! But risks can have rewards, and in this case, one of the rewards was that this crystal is now almost fully exposed on one side. I have added a new child photo showing one of the previously hidden faces. Because there are so many other "child" and "related" photos, here is a direct link to the new photo so as to make it easy to find: [https://www.mindat.org/photo-1063460.html].
Preliminary update Nov 2020: Recent analysis indicates that the "black chlorophoenicite" does, in fact have As (in fact lots of it), and per EDS, Raman and XRD is "chlorophoenicite-like", so quite possibly it is actulaly "mineral E of Dunn". See [https://www.mindat.org/photo-1101772.html] and other great photos of putative "mineral E" by Travis Olds as well as (e.g.) [https://www.mindat.org/photo-930212.html] and [https://www.mindat.org/photo-458374.html] which show particulary rich concentrations of the mineral.
Update June 2021: It now seems that the "pyrochroite" ID for the "black chlorophoenicite" must have been bogus. I don't know what went wrong, but clearly something did. There is, in fact, pyrochroite on the specimen. But it is all pseudo-cubic - it is not repalcing the bladed chlorophoenicite. The dark blades are probably "mineral E of Dunn". For details see [https://www.mindat.org/photo-930212.html].
Note added August 2023: See [https://www.mindat.org/photo-930212.html] for the status of "mineral E". Bottom line: The structure can't be determined with current technology from these samples.
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