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Improving Mindat.org"Ferribraunite/Ferrian Braunite" missing from Mindat, references in English and Russian found
19th Apr 2024 11:02 UTCVik Vanrusselt Expert
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":
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)).
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):
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):
Mason, B. (1944): The system Fe2O3-Mn2O3: some comments on the names bixbyite, sitaparite, partridgeite. Am. Mineral. 29, 66-69. [http://www.minsocam.org/ammin/AM29/AM29_66.pdf]
Any help in figuring out what this is, is greatly appreciated.
Any help in figuring out what this is, is greatly appreciated.
Thank you all,
Vik
19th Apr 2024 11:52 UTCKeith Compton 🌟 Manager
Vik
I note that one of the references in the page you reproduced (at least a more complete reference as follows) is:
Wassertstein, Benno (1943) On the presence of boron in braunite and manganese ores. Economic Geology 38 (5): 389–398.
I note from the prelims that it mentions the CF Van der Walt article also mentioned.
Perhaps this can be checked by someone
19th Apr 2024 12:30 UTCDavid Von Bargen Manager
The investigation was primarily concerned with the ores from the Postmasburg area and the accent was on the ore minerals from there but, as can be seen from the results given, the minerals cover the manganese ores mined in all parts of the world. For a better understanding of the mineral terms "partridgeire," "sit.aparite" and "ferribraunite"--the last is not listed in the results--the reader is referred to Fig. 1 of Mr. de Villiers' contribution in the manganese memoir to be published shortly by the Geological Survey of the Union of South Africa. 8 Ferribraunite is not stressed as a new mineral species, and gave results from a trace to 0.1 per cent, but it represents chemically a product intermediate between sitaparite and braunite. Recently it has been claimed that sitaparite should be classed among the discredited species; • this matter appears to be controversial and the name is here retained for minerals intermediate in composition between bixbyite and partridgeite. This last new mineral term has been introduced for "natural Mn20.•" • and may be regarded as a silica-free braunite to which it is closely related. In the samples examined spectrographically notable amounts of braunite were always admixed with the partridgeite owing to the difficulty of separating these two minerals.
8 Boardman, L. G., et. el.: The Manganese deposits of the Union of South Africa. S. Africa Geol. Surv., Mem. (In preparation.)
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