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 |
| 2 | Fill screen with image |
| 3 | Switch to 3D display of stereo pair |
| 4 | Switch left/right images in 3D mode |
| 5 | Display at full resolution |
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Update June 2021: It now seems that the "pyrochroite" ID (for the adrk bladed crystals) must be bogus. I don't know waht went wrong, but clearly something did.
For details see [https://www.mindat.org/photo-930212.html].
Note added 6/30/20: As noted earlier for most of the "Mineral E" photos, a recent (Oct 2019) EDS scan of dark prisms from this find was found to be very similar to a scan for Zn enriched pyrochroite from the Sterling Mine. This is a very surprising result. See the related (same minID) analysis photo. No trace of As was found, so this can hardly be "mineral E of Dunn", but I have kept that label because this photo is one of the photos shown in the header of the info page for "mineral E". (See June 2021 uodate!)
Originally posted as "chlorophoenicite" because there are very similar looking crystals on this and other fragments of the original specimen that are nearly colorless and look like chlorphoenicite. (Even the tips of some of the very dark crystals are translucent.) But as of Jan 2019, Van King has determined that the dark crystals are very likely "Mineral E of Dunn" - which see. Hence I have changed this description, and some of the others in sibling and "related" photos by putting the "chlorophoenicite" in quotes and/or changing it to "mineral E". (As noted by Dunn, 1995, p. 688, mineral E is chlorophoenicite-like and both are monoclinic, class 2/m.) I have retained the designation "chlorophoenicite" for the nearly colorless crystals found on this and other fragments.
The mineral E crystals are very sharply formed but jet black. Originally that was attributed to staining, and that may be part of the reason, but, according to Dunn, mineral E is inherently dark brown. See the "related" (same min ID) photos for more examples and discussion.
The leucophoenicite in the cavity is also stained (it should be pink) but, interestingly, the zincite is not (and neither is some sphalerite which is just out of sight.) Note: According to Van King, somewhat similar, but not striated, crystals on the specimen are vesuvianite, rather than leucophoenicite, but I haven't been able to confirm this on the fragments currently in my possesion.
Although the mineral E is jet black, it is very reflective and hard to photograph. The xls have excellent terminations - something that may be more evident in stereo - see the child photo. Note that the crystals described by Dunn have mostly rough to branching terminations. The mineral was not submitted for IMA approval because of discrepancies between the chemical and X-ray data and because of anomalous optical data. Possibly the crystals from this find might be more suitable for structure determination etc. That remains to be seen.
This photo shows free standing (red) zincite xls with bladed (black !) crystals of mineral E. The jet black color is obviously more like groutite. However the "dagger" habit (see the xl in the center) is more like chlorophoenicite. Cf Fig 25-21 in Dunn's FSH monograph. Dunn also notes (p. 664) that chlorophoenicite is easily stained. A staining agent was, in fact, present in the vein because the purplish blob on the rhs is actually pink leucophoenicite coated with some dark substance. But as noted by Dunn, the color of mineral F is dark brown, and that is the color of many of the crystals. Some of the darker crystals may also be stained - over and above their inherent dark colr.
A similar occurrence (with unstained chlorophoenicite) is described by Palache (p.50). The groutite occurences described by Dunn seem to be quite different.
Note added May 2015: I have now found some tiny, isolated, vugs with colorless, unstained crystals of chlorophoenicite of the same habit on this and other fragments of the original specimen. A photo of one of these has been added as a sibling image.
However, this photo is actually from a different fragment than that of the parent photo and most of the other sibling photos. While it is useful to retain it as child photo here, I have changed the minID to correspond to that of the actual fragment. In that way, this will still show up as a child photo here, but it will also show up as a "realted" photo under the other parent photo (etc.).
The photo itself could stand some improvement - but it's a really tough subject.
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