UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995) : Mg5(Zn,Mn)3(CO3)2(OH,Cl)12·H2O, Fluoborite : Mg3(BO3)(F,OH)3
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UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995) : Mg5(Zn,Mn)3(CO3)2(OH,Cl)12·H2O, Fluoborite : Mg3(BO3)(F,OH)3
Field of View: 5.2 cm
October 2013. The glassy fibers filling some of the layers in the "blob" have now been verified as fluoborite by Dr. A. McDonald (Larentian Unversity) using XRD (see new child "photo'). Two additional samples, one of fibers completely embedded in pyrochroite and another of fibers from the same assemblage, but not directly in a "blob" were also determined to be fluoborite. Sussexite and szaibelyte were looked for but not found in any of the samples.
Nov 2014: The UM1986-10-CO (mineral F) has now been analyzed and shows an EDS spectrum essentially identical to that for "classic" mineral F [http://www.mindat.org/photo-442449.html]. See the new child "photo".
April 2021: Added a new close-up of some of the fluoborite growing on one of the layers of platy black exsolution material.
This is #6 in a series. This is a replacement of a “blob”. Not exactly a pseudomorph because there’s really no “morph” to it. The “layered” structure is very characterstic. All of the examples that I found – and there are many – have this structure. These blobs are found in calcite from the 430’ level with little or no megascopic willemite or franklinite.
The most interesting constituent of the replacement appears to be “Mineral F” (of Dunn) – something I realized just recently. (For a discussion about Mineral F from a somewhat different environment, see the talk page for http://www.mindat.org/photo-442449.html ) In the photo, the most conspicuous Mineral F consists of the little cream/white spherules in the lower left cavity. But some of the “layers” also seem to be Mineral F (which effervesces with HCl). Other layers consist of another cream/white/pink substance that does not effervesce – probably rhodochrosite. (Mineral F tends to form spheroids and has “foamy” appearance. The other mineral does not.)
The major component of other layers consists of fluoborite needles (now verified). At one time it was suspected that at least some of these needles were szaibélyte but John Ciancilulli found (via optics at least) that they were fluoborite (i.e. neither szaibélyite nor sussexite). As far as I know, szaibélyite was never conformed in this material. These fibers loosely fill some of the “layers” and are sometimes oriented perpendicular to the “surfaces”, but in other cases they grow helter-skelter more or less parallel to these surfaces.
The black stuff separating layers was suspected to behetaerolite (see photos earlier in this sequence). However a recent (Feb 2019) EDS scan of a sample from another specimen indicates Mn enriched franklinite - which makes the origin of these layered blobs even more mysterious.
Microscopic willemite is abundant but confined to the rims of the blobs and other seams in the calcite.
Because of the blobby and layered appearance, I suspect that zincite was the precursor, But it is very diificult to see how that would happen geochemically.
This is #6 in a sequence leading from zincite and tephroite to “Mineral F” (of Dunn) and fluoborite. See http://www.mindat.org/photo-446521.html for the previous photo in the sequence; http://www.mindat.org/photo-446523.html for the next.
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