I have recently acquired a specimen of socalled "ferribraunite" from https://www.mindat.org/loc-205398.html

However, I can't find this "species" on Mindat (yet).

My questions to you all:

- What exactly is "ferribraunite/ferrian braunite"?

- Since both braunite and bixbyite-(Mn) are listed as occurring at the locality my specimen claims to be from, I don't think it is out of the question that "mixtures/intergrowths" of both species can occur (here) as well?

- Can someone please add "ferribraunite" and/or "ferrian braunite" to Mindat?

I have found the following references to the existence of "ferribraunite/ferrian braunite":

1) Peter Bayliss, in his "Glossary of obsolete mineral names" (1st edition 2000, 2nd edition 2011), claims it is "braunite + bixbyite".
2) Mr Bayliss bases this claim on the information in

Spencer, L.J. (1949) Eighteenth List of New Mineral Names. Mineralogical Magazine: 28(206): 722-742 (page 728 to be exact).

-> See https://rruff.info/doclib/MinMag/Volume_28/28-206-722.pdf

3) Mr Spencer claims it is an "intermediate between braunite and sitaparite."
(Sitaparite is apparently, now called Bixbyite-(Mn)).

He bases this claim on the information in

Wasserstein, B. (1943) On the presence of boron in braunite and manganese ores. Economic Geology: 38(5): 389-398 (on page 393 to be exact).

-> I have not been able to find the complete article online.
An abstract is available at
https://pubs.geoscienceworld.org/segweb/economicgeology/article-abstract/38/5/389/15760/On-the-presence-of-boron-in-braunite-and-manganese)

4) Another reference I have found is

Shubnikova, O.M. (1953) New mineral species and varieties discovered in 1945-1949. Works of the Institute of Geological Sciences: Issue 144: Mineral Geochemical Series No. 16: 42 (in Russian).

-> See http://www.ginras.ru/library/pdf/ign_144_1953_min_geochem_ser16.pdf

-> I have added the Russian description of "ferribraunite/ferrian braunite" to this message, maybe someone can translate it for those of us who can't read Russian?

-> According to this description (or at least according to my attempt to translate it with Google Translate), the mineral is "a variety of braunite containing 16% FE2O3", is homogenous and NOT a mixture of braunite and bixbyite

-> Moreover, according to this description, Wasserstein considered "sitaparite" a distinct mineral between braunite and "partridgeite", but if I understand correctly, both "sitaparite" and "partridgeite" have now been "grouped together" as synonyms of bixbyite-(Mn)?

See references (I haven't read these yet):

Thank you all,

Vik